Wizet

In April 2001, Wizet, a game development company, was established in Seoul, South Korea. The company was initially led by Seung-chan Lee, who was previously a lead developer for Nexon's QuizQuiz. Wizet would develop and eventually release MapleStory for Korea in April 2003. Shortly after its release, the game reached a milestone of 100,000 concurrent users and 2 million registered users, according to the company's now-defunct website. Wizet would launch MapleStory in Japan later that year with similar claims of success. In 2004, Nexon acquired Wizet and since then has maintained active development and publishing of MapleStory.

Source: IGDB