Eun-young, who is lonely with no lover, is Hyojin, a studio junior. When you hear that you have a lover, ask for an introduction. Hyojin introduces her lover Kyuhyun to Eunyoung on the way to work. Kyuhyun is a lover who broke up three years ago. Kyuhyun secretly begs Eunyoung to come back to Hyojin, but Eun-young is married. We meet again with Kyuhyun's endless courtship. Hyojin gets caught. Eun-...

Junhyuk tells her lover Younghee that she can’t have sex too much. Minsu introduces a woman who teaches sex to Junhyuk, who is sad. Junhyuk takes different sex classes from three women, and each day is reborn as a sex machine…