Cho ‘Maru’ Sung Choo has played in one foreign tournament so far: IPL4. IGN awarded him a spot in the Open Bracket because his team, Prime, was playing in the GSTL finals, which were also hosted at IPL4. Maru’s performance was not especially strong, however; he only defeated CatZ and Illusion before falling 0-2 to TaeJa and 1-2 to Virus.
Maru was able to qualify for WCS Korea 2013 Season 2 Premier League, hosted by OGN, through the Challenger League Group Stage. He went on to beat former Semi-Finalists sOs and Symbol on his run to his own Semi-Final debut. Once there he pulled a series of major upsets, defeating INnoVation and later Rain to take the WCS Korea Season 2 Premier League First Place and an OSL title.