Shen Dong has been a cautious and steady child since he was a child. He wants to study hard and not meddle in other people's business. But once he accidentally saw Song Zhiyuan and a woman making out in the car, and Song Zhiyuan was Shen Dong's new roommate. The two people from different backgrounds have serious differences in life and thinking, but as time goes by, they cater to each other and gradually develop a forbidden love.