Jung Joon-young, 30, admitted to secretly filming himself having sex with women and sharing the footage.
"I admit to all my crimes," said Jung in a statement. He also promised to drop all his TV and music work.
It comes a day after superstar Seungri from the group Big Bang quit the industry after he was charged with sex bribery.
Jung, who is accused of taping 10 or more women, is due to be questioned by Seoul Metropolitan Police on Thursday.