Mi-jung wakes up a different gender every morning. She's Nam Mi-jung when she's a man and Yeo Mi-jung when she's a woman. Her friend Jin-soo is in love with Yeo Mi-jung. She also has a girlfriend named Eun-seo. A ridiculous love story takes place between these four people.

A lonely young man is in dire straits, but his friend's mothers don't see him as a boy, but as a man, and take extra interest in him.