Jae Hoon was discharged from the army and came to his idol trainee younger sister's accommodation to stay for a few days. At the house, his sister's idol trainee friends, Hyeon Joo and Yeon Joo, are there. Her friends have a good feeling about good-looking Jae Hoon. In the middle of the war between the two women for possession of Jae Hoon, embarrassed Jae Hoon makes a shocking proposal to Hyun Joo and Yeon Joo...