Kim Mun'gyu worked at one of the earliest Korean PC game developers, Family Production, on that company's first game Boksu Mujeong1, before leaving and founding the (initially) 2-man team Trigger Soft with employee no. 1 Jeong Musik. Lacking a programmer, they produced their first couple of games in cooperation with other companies: At first they helped out with the graphics part on SiEn Art's Into the Sun, then a company called EST Soft helped out with their own Last Laibers. The first big success, however, that put the company on everyone's radar, was War Diary, an RTS based around the Japanese invasions into Korea at the end of the 16th century. Their partner this time was the indie developer HQ Team, which eventually became the other poster child for Korean RTS games2.

After more successes with above-average attention from overseas publishers, the company seemed to have stumbled over the gap to the MMO market. Its first online game, Rhakmu, was shut down after a short open beta phase, and while developing Rose Online, it was absorbed by the games publisher, Gravity, in May 20053.

Jeong Musik was also the co-founder of the Korea Game Developers Association (KGDA), from September 2000 until today the longest-living association of Korean game developers that also hosts the Korean Game Conference since 2001, and became its first chairman4. He left Trigger Soft in 2003 for NC Soft, and switched companies once again in 2006, when he co-founded Gorilla Banana with CEO Kim Chanjun, where he is developing Red Blood5.

President Kim Mun'gyu's immediate future unfortunately seems to have been not so bright. In 2006 he appeared as the CEO of a company called Digmsoft6, which vanished without having released anything. There couldn't be found a trace of his activities after that.