The 5th Member - Kangin

Kim Youngwoon (born January 17, 1985), better known by his stage name Kang-in, is a singer, entertainer, and a member of Korean boy band Super Junior. He was one of the three MC's for M.NET's M!Countdown along with bandmates Leeteuk and Shindong before he was replaced by Eunhyuk. He was also a former DJ for Reckless Radio where Super Junior members often visited as guests, but is now replaced by bandmate Sungmin. He is currently a DJ for MBC's Good Friend Radio with Taeyeon of Girls' Generation.

A time-slot dispute occurred between SM Entertainment and MBC when SM insisted to have Kang-In stay on SBS's Explorers of the Human Body instead of MBC's Sunday Sunday Night Dong-An Club where Kang-in was a regular host. MBC decided to temporarily ban Super Junior from appearing in any future performances on MBC. Kang-in was replaced by T.O.P of Big Bang as the MC of Show! Music Core. Kang-in can also no longer host MBC variety shows Nothing is Impossible and Sunday Sunday Night Dong-An Club until the conflict is resolved. MBC also demanded to receive an apology from SM Entertainment if SM artists should continue to perform on shows hosted by the channel. After Kang-in left Nothing is Impossible and Sunday Sunday Night Dong-An Club, both shows cancelled due to low ratings. Kang-in's radio program with MBC, Good Friend Radio continues to air since it is not related to his work conflict. A week later, MBC announced that they invited Super Junior to film an exclusive MBC segment, "Giving Children a New Life" despite their previous decision to ban Super Junior. The entertainment director for MBC claimed that the ban on Super Junior was never official, but just a decision made by the programs' producers.

On December 16, 2008, it was officially announced that Kangin would be part of MBC's reality variety show We Got Married, partnered with actress Lee Yoon Ji.