Yeong-gil is in graduate class and is stressed about getting a job. To make things worse, he's not had any experience with women yet, so he's always searching for something in his dreams but wakes up to nothing. Then one day, there is a change in his life, he puts his hand in The Box of Pandora and gets a job although it wasn't a regular position. He sleeps with his female superior during the interview even though it's not how he imagined it. Then one day, he visits Joo-yeon's home and meets her beautiful mother. Can he keep himself from being seduced by this woman?

Joon-soo learns that his friend Hee-gyu's sister Hee-jin has no where to go after being scammed, so he suggests living with him. The two start living together. They are close like brother and sister but they can never be that. The two start getting funny and Joon-soo can't go to sleep at the thought of Hee-jin sleeping just a wall away from him. Mi-na, Joon-soo's girlfriend notices Joon-soo changing and seduces Joon-soo at his house where Hee-jin is. Is it the girlfriend or the sister?