Kai Ko Chen-tung (; born Ko Chia-kai on 18 June 1991) is a Taiwanese actor, singer and film director. Ko won Best New Actor at the 48th Golden Horse Awards and the 12th Chinese Film Media Awards for his starring role in the film ''You Are the Apple of My Eye'', also his film debut. In November 2011, Ko released his debut studio album, ''Be Yourself''. His career was derailed when he was arrested on drug charges in 2014, which led him to be banned in Mainland China.
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