Kang Seung Yoon, a Top 4 contestant on 'Superstar K2', was eliminated on last week's episode of the show. His last charismatic performance was a cover of Yoon Jong Shin's song, 'By Instinct.' Even after his elimination, Kang Seung Yoon's popularity did not die down; rather, it increased to the point where the original song - released back in May - started to climb up various music charts once more. Yesterday, Kang Seung Yoon's cover was released online, and it should come as no surprise that his song also climbed to high positions on various music charts. Today on M! Countdown, Kang Seung Yoon held his debut performance with 'By Instinct'. This was his first time performing on broadcast show outside of Superstar K2, and with his rocking vocals, his performance was terrific. Check it out below!