In order to save money, Su Xiao, who had just graduated, decided to rent a house with others. However, she never expected that her roommate would be her "rival" in high school, Gu Yan - the top student who once made her gnash her teeth. Gu Yan was still calm and indifferent, as if he didn't care about everything in the past, but Su Xiao couldn't help but think of all the scenes when she was "crushed" by him.
Living under the same roof, the two began to fight each other and gradually understood each other. Su Xiao discovered that Gu Yan had a gentle heart hidden under his cold appearance, and Gu Yan was also attracted by Su Xiao's optimism and tenacity. However, just as the relationship between the two was gradually warming up, Gu Yan's ex-girlfriend suddenly appeared, breaking the peace.
Su Xiao began to wonder if she was just a passerby in Gu Yan's life. Gu Yan also faces a choice: continue to hide his feelings, or bravely face the past and strive for a future with Su Xiao? A shared relationship about trust and courage begins.
