note my translation isn't perfect or correct, but the gist of the original article is there
Three members of KT Rolster's winning season last year have announced their retirement.
With Flash commandeering the Terran line, it would have been impossible for Suny to get games this season. Considering this, he has decided to retire and go to the military.
Despite being one of the key players in KT's playoff run, Perfective had lost interest in the game. He will be going back to his home town to rest before entering the military.
Anyppi received regular playing time with the old best of seven format, but with the new best of five format, he saw it would be difficult to get playing time now, so he has decided to leave the team and retire from Brood War. However, he does not plan on entering the military just yet, and is considering switching to Starcraft 2.
Head Coach Lee Ji-Hoon says that because of the new best of five format, players who seldom saw playing time under the old best of seven format would struggle to find playing time in the new format. Because of this, the players became discouraged, and that retirement seemed the most optimistic option for them.
Source: DailyESPORTS' Nam Yoon-sung