King Dongmyeong, also known by the birth-name Jumong (surname: Go) was the first Taewang of Gorguryeo.
source: Wikipedia
Goguryeo, along with every developed East Asian state at the time wrote using Chinese characters, which was the universal writing system in East Asia.
Upon unifying China, the Sui dynasty attempted to establish dominance over all its neighbors and declare itself as the region's superpower. It managed to subjugate Japan, Vietnam, Tibet, and Southern Korea but Goguryeo (the most powerful of the three kingdoms of Korea) refused to acknowledge the Sui Dynasty's supremacy. This caused the Sui to invade Goguryeo resulting in the Goguryeo-Sui war. Goguryeo managed to defeat the Sui dynasty and after two failed invasions, the Sui dynasty failed economically which resulted in resentment of the Chinese people and ultimately the downfall of the dynasty. In essence, Goguryeo was the most significant factor contributing to the downfall of the Sui.
There are many important historical figures throughout the History of Korea. Determining which of them is the MOST important person is up to your personal opinion. Some of the most important Korean historical figures include, Dangun of Gojoseon (legendary founder of Gojoseon, the first Korean kingdom), Gwanggaeto the Great of Goguryeo (credited with making the Korean kingdom Goguryeo into a major Asian power), Wang Geon of Goryeo (credited with the founding of Goryeo as well as the complete unification of the Korean peninsula), King Sejong the Great of Joseon (credited with the creation of Hangul, the Korean alphabet, as well as the conquest of Tsushima and other regions), Admiral Yi Sun-Sin (savior of Joseon during the Imjin War and inventor of the ingenuous turtle ship), and Syngman Rhee and Kim Il-Sung (for dividing the Korean peninsula after 1300 years of unification).
The three kingdoms in Korea were named Goguryeo, Baekje, and Silla.
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Sino-Corean War [Goguryeo-Sui War] (598-614) -The Sui dynasty of China invaded the Korean kingdom Goguryeo with a supposed force of over a million soldiers. This resulted in a tremendous Goguryeo victory and the destruction of the Chinese Sui dynasty.
Goguryeo ended in 668.
an ancient artifact from goguryeo
Anjang of Goguryeo died in 531.
Jungcheon of Goguryeo was born in 224.
Sansang of Goguryeo died in 227.
Bongsang of Goguryeo died in 300.
Dongcheon of Goguryeo died in 248.
Seocheon of Goguryeo died in 292.
Micheon of Goguryeo died in 331.
Jangsu of Goguryeo was born in 394.