Kim Youngwoon was born January 17, 1985; he is better known by his stage name Kang-In. He is a singer, dancer, actor, MC, DJ, television hos, and a member of Super Junior.

Kim Youngwoon became a trainee under SM Entertainment, soon after he won first place on the 4th SM Youth Best Selection Best Outward Appearance in 2002. He was originally auditioned to be an actor, he was placed under many all-boy project groups, including the rumored group Four Seasons, a four member boy band that was to include Kim Heechul, Hero Jaejoong, and U-Know Yunho. However, both U-Know Yunho and Hero Jaejoong soon debuted as members of TVXQ in 2003, leaving Kim Young-woon and Kim Heechul to join Super Junior two years later. Kim Young-woon decided to use the stage name Kang-In, which can be loosely translated to "strong person," to show his strength as an entertainer and performer.