Yasukuni Shrine, which honors prime wartime criminals. South Koreans are opposed to the glorification of Japan's colonial rule and wartime actions in Japanese school textbooks and to Japanese politicians' visits to the Yasukuni Shrine. Prime Minister Takaichi Sanae visited Yasukuni Shrine on August 15th, prior to his inauguration, but has not visited since taking office.
Complex, Multifaceted, Significant Cultural Exchange, Intense Conflict, and Deep-Seated Political Tension that Continues to Influence Modern Relations
The historical relationship between Korea and Japan is a complex and multifaceted one, marked by periods of significant cultural exchange, intense conflict, and deep-seated political tension that continues to influence modern relations.
The relationship is often sum-marized by the phrase “so close, yet so far,” reflecting deep geographical proximity and cultural intermingling alongside a history of conflict and lasting animosity.
Ancient Foundations and Cultural Flow (Pre-7th Century)
From as early as the Yayoi period (c. 300 BCE–300 CE) in Japan, there was active contact between the Korean Peninsula and the Japanese archipelago. Korean migrants brought wet-rice agriculture, ironworking, and advanced technology to Japan.
In ancient times, the Korean Peninsula was a cultural and technological bridge between the Asian continent and the Japanese archipelago. The kingdoms of Goguryeo, Baekje, and Silla on the Korean peninsula had extensive contact with the various clans and emerging statelets in Japan (known as Wa).
The Kingdom of Baekje had particularly close relations with the Yamato court in Japan. It is credited with transmitting foundational elements of civilization to Japan, including Chinese Writing System(Hanja), Buddhism, and Technology.
While Baekje did not directly create the Japanese writing system, it played a foundational and indispensable role by introducing the Chinese writing system and the classical Chinese literacy that served as the direct precursor and raw material for the development of Japanese scripts.
Baekje was a highly sophisticated state with deep knowledge of Chinese culture, Confucianism, and Buddhism. The Yamato Court in Japan during the Kofun and Asuka periods was a developing polity that actively sought advanced knowledge and technology from the mainland to consolidate its power. The Korean peninsula was the primary conduit for Chinese culture to reach Japan. Baekje, in particular, had friendly and active diplomatic relations with the Yamato court.
The most famous and symbolic event is recorded in both the Japanese Nihon Shoki (Chronicles of Japan, 720 CE) and the Korean Samguksagi (History of the Three Kingdoms, 1145 CE).
According to these records, in the year 405 CE, a Baekje scholar named Wani(왕인, 王仁) arrived at the Yamato court. He brought with him Confucian classics, specifically the Analects of Confucius and the Thousand Character Classic (a primer for learning Chinese characters), and became the tutor to the crown prince.
This event is critically important because it marks the formal, systematic introduction of the Chinese writing system to the Japanese elite. It wasn’t just about writing, but it was about importing an entire system of thought, governance, law, and philosophy encoded in those texts.
The Japanese language is struc-turally completely different from Chinese, while Simply using Chinese characters to write Japanese was a major challenge. The solution evolved over centuries, and Baekje’s initial introduction was the essential first step.
Over time, for speed and simplicity, scribes began writing these characters in a highly abbreviated and cursive form. Hiragana was evolved from the cursive form of whole Man’yogana characters. It was initially known as “women’s hand(onnade)” as it was popularized by court ladies like Murasaki Shikibu, author of The Tale of Genji. Katakana was evolved from taking a small part of a Man’yogana character. It was developed by Buddhist monks as a shorthand for annotating Chinese texts and for pronunciation guides.
Baekje’s role was not limited to just bringing a book. The transmission was sustained and multifaceted. Baekje regularly sent scholars, like Wani, to teach the Japanese aristocracy.
And Baekje officially introduced Buddhism to Japan. This brought a massive influx of religious texts, all written in Chinese, which further necessitated and deepened literacy. Many literate Baekje emigrants settled in Japan, serving as scribes, record-keepers, and administrators for the Yamato court, directly implementing the writing system in governance.
This history is a classic example of the deep cultural interconnectedness of East Asia. While historically well-documented, it can sometimes be a sensitive topic due to modern nationalisms. However, the academic consensus is clear: the influence of Baekje and the broader Korean peninsula in transmitting Chinese civilization to Japan was profound and decisive in the formation of the Japanese writing system.
Korea’s Goryeo Dynasty (8th–14th Century)
Following the unification of the Korean Peninsula by Goryeo and the establishment of the Heian period in Japan, official contact between the two courts was minimal. Unlike the previous Unified Shilla period, which had active diplomatic ties with Heian Japan, Goryeo and Japan viewed each other with a degree of suspicion and saw little need for formal relations.
There were no sustained, official diplomatic missions between the Goryeo court and the Japanese Imperial Court in Kyoto. Both were internally focused.
The Rise of the Wako was the single most dominant feature of the relationship during this era. Wako, which literally means ‘Japanese pirates,’ began raiding the Korean coastline in the 11th Century. These were not state-sanctioned forces but often a mix of rogue samurai, ronin, and fishermen from coastal provinces of Japan who turned to piracy for profit.
Goryeo had to invest significant resources in coastal defense, building forts and maintaining a navy to repel these raids. Any trade that occurred was likely small-scale, indirect, and conducted through local intermediaries or merchants from Tsushima Island, rather than being state-sponsored.
But, after the Yuan Dynasty(Mongol) began to weaken in 14th Century, Trade and Diplomacy changed dramatically. Goryeo and Japan saw an opportunity for legitimate trade. The Muromachi Shogunate (1336-1573) in Japan, under the Ashikaga shoguns, became a willing partner. Goryeo established official trading posts and guesthouses, known as Waegwan, in key coastal cities like Ulsan and Naju. These became hubs for diplomatic envoys and Japanese merchants.
Korea exported ginseng, porcelain (famous Goryeo celadon was highly prized), paper, ink, and Buddhist scriptures. Japan exported sulfur (for gunpowder), copper, gold, mercury, swords, and tropical woods like sappanwood.
Cultural and religious exchange also became a conduit for culture. Goryeo monks traveled to Japan, and Japanese monks came to Korea, facilitating the exchange of Zen (Seon in Korean) Buddhist teachings, art, and texts. There is evidence that Goryeo’s advanced metal movable type technology (invented in 1234) influenced later developments in Japanese printing.
The Goryeo court sent official envoys to Japan, and the Muromachi Shogunate sent missions to Korea. This was the most active period of state-to-state contact during the entire Goryeo era.
Cultural Exchanges under Joseon Dynasty (14th–19th Century)
The relationship between Korea’s Joseon Dynasty (1392-1897) and Japan during the same period is a dramatic story that evolved through distinct phases: from initial peaceful diplomacy, to a devastating invasion, to two centuries of tightly controlled isolation, and finally, a forced re-opening in the modern era.
The Joseon Dynasty was founded by Lee Seong-gye just as Japan was unifying under the Ashikaga Shogunate. Both new regimes sought stable diplomatic relations. Joseon established ties with the Ashikaga Shogunate, viewing it as the legitimate government of Japan. The feudal lords of Tsushima Island, played a crucial role as intermediaries. Tsushima’s economy was heavily dependent on trade with Korea.
Joseon adopted a foreign policy of Gyorin, meaning “treating the neighboring country with courtesy.” This involved official trade missions, Waegwan (Japanese house), and cultural exchange. Joseon granted the right to send a limited number of trading ships to Korean ports and established a permanent Japanese trading enclave and diplomatic mis-sion in 3 ports. This was the only place where Japanese were allowed to reside and trade. Japanese envoys included monks and scholars who exchanged knowledge, and Joseon valued imports like copper, sulfur, and medicinal goods.
Although greatly reduced from the Goryeo era, the threat of Wako never fully disappeared. A primary goal of Joseon’s diplomacy was to get the Japanese authorities to control and suppress piracy.
The Great Rupture – The Imjin War (1592-1598)
Japan launched a massive invasion in 1592 and again in 1597. The war devastated the Korean Peninsula. It was the most catastrophic event in Joseon-Japan relations and left a deep, lasting trauma on Korea.
It was a devastating international conflict involving the Joseon Dynasty of Korea, Toyotomi Japan, and the Ming Dynasty of China.
The primary driver for the invasion was the ambition of Toyotomi Hideyoshi, the Japanese warlord who had recently unified Japan after a century of civil war (the Sengoku period).
In April 1592, the Japanese launched a massive invasion force (estimated at over 150,000 troops) landing at Busan.
The Joseon army, unprepared and lacking modern firearms like the Japanese arquebus (musket), was quickly overwhelmed. Within weeks, the Japanese captured major cities, including the capital, Hanseong (modern Seoul). King Seonjo fled north to Uiju near the Chinese border, seeking aid from the Ming Dynasty.
The Japanese momentum was decisively broken by the Joseon Navy, led by Admiral Lee Sun-sin. Lee employed superior naval tactics and his innovative armored warships, the turtle ships, which featured cannon and an armored top deck.
Through a series of crushing victories (like the Battle of Hansan Island), Admiral Lee’s fleet effectively cut off the Japanese army’s vital sea supply lines from Japan, leaving the forces stranded and hungry on the Korean Peninsula.
The Ming Dynasty (China), reco-gnizing the threat to its own security, dispatched a large expeditionary force to aid Joseon. The combined Ming and Joseon forces, along with local Korean civilian militias engaging in guerrilla warfare, pushed the Japanese forces back from Pyongyang and the northern provinces.
The first invasion ended with a negotiated, though unstable, armistice in 1593. The Korean Peninsula was utterly ravaged. Cities, cultural sites, and farmland were destroyed. The population suffered massive casualties and famine.
The Japanese forces, unable to advance further without supplies and facing sustained resistance, withdrew to a defensive position along the southern Korean coast, leading to several years of fraught negotiations and a brief pause before the second invasion in 1597.
The reserve army of 100,000 men was sent across to Korea to bolster the Japanese forces already there. In August 1597 CE Hideyoshi set them the task of permanently annexing for Japan the four southern provinces of Korea. The object was much more limited than the first invasion, but this time several factors were against the Japanese right from the start.
First, the Koreans now knew what was coming and were much more prepared. Second, a Chinese army was now already in Korea. Third, the excellent Korean navy, still commanded by Yi Sun-sin (back after a brief imprisonment thanks to his rivals’ machinations), had not gone away and still controlled the coastal waters.
The invasions, known in Korea as the Imjin War, were incredibly destructive. They resulted in the widespread devastation of the peninsula, massive loss of life, and the destruction of cultural treasures.
The war is remembered as a “national trial” for Korea. It solidified the image of Japan as an aggressive and brutal invader. The war also led to the capture of many Korean artisans and scholars, who were taken to Japan, further transmitting Korean culture (e.g., pottery techniques that influenced Japanese ceramics).
After the invasions, the relationship entered a long period of limited and highly regulated contact. Korea, deeply traumatized, maintained a policy of suspicion towards Japan. At that time, Japanese island of Tsushima, located between the two nations, acted as the sole diplomatic and trade intermediary.
The Joseon court occasionally sent diplomatic missions to the Tokugawa Shogunate in Edo (Tokyo). These missions were more about maintaining a formal relationship than fostering close ties.
The Colonial Period (1910-1945) – The Most Contentious Legacy
This is the most painful and directly impactful period on modern Korea-Japan relations. Following the First Sino-Japanese War (1894-95) and the Russo-Japanese War (1904-05), Japan formally annexed the Korean Empire in 1910. Japan implemented a harsh policy to suppress Korean culture and identity:
The Korean language was sup-pressed, and Japanese was made the official language. Koreans were forced to adopt Japanese names. Shinto shrines were built, and worship was enforced. In economic fields, Korea’s resources were funneled to support Japan’s industrial and war efforts.
Tens of thousands of Korean women were forced into sexual slavery for the Japanese military (comfort women), a issue that remains a major diplomatic flashpoint today. Many Koreans were conscripted to work in harsh conditions in Japanese mines and factories.
The colonial period is viewed by Koreans as a humilitating and brutal experience, and its legacy is the primary source of ongoing historical disputes.
Post-War and Modern Relations (1945-Present)
After World War II, Korea was liberated but divided. Relations with Japan were frozen for two decades. Under pressure from the U.S., South Korea and Japan signed the Treaty on Basic Relations in 1965, which normalized diplomatic ties. Japan provided South Korea with economic grants and loans, which played a role in South Korea’s subsequent economic development.
Despite historical grievances, the two nations have become deeply intertwined. They are major trading partners, and cultural exchange is massive, with Korean pop culture (Hallyu) and Japanese anime/manga being highly popular in each other’s countries. Of course, tourism flows in both directions are significant.
Two countries, among the wo-rld’s most advanced nations, are deeply troubled by unsolved persisting historical disputes. The relationship is perpetually strained by unresolved issues. ‘Comfort Women’ issue demands for a more sincere official apology and legal compensation.
Recent South Korean court rulings ordering Japanese companies to compensate forced labor victims have sparked major diplomatic crises. Korean objections to the whitewashing of Japanese colonial and wartime actions in Japanese school textbooks and visits by Japanese politicians to the Yasukuni Shrine, which honors war criminals.
The Korea-Japan relationship is a classic case of history casting a long shadow over the present. While the two nations are natural economic and cultural partners in the modern world, shared history – particularly the trauma of the colonial period – remains a powerful and often disruptive force. The path forward involves a delicate balance between pragmatic cooperation for mutual benefit and the difficult, ongoing process of historical reconciliation.★
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