As her seemingly idyllic life begins to crumble, a lonely woman in a restrictive marriage starts an affair with a gentle bookstore owner.

Su Yu, a high school student who lives a simple life with his father, faces a major change when his mother remarries a wealthy man, introducing him to his step-brother Wu Bi. Despite their initial differences-Wu Bi being a cold and arrogant top student, while Su Yu is an unreasonable underachiever-their relationship takes an unexpected turn after an accident. As they gradually warm up to each other, their bond grows stronger. However, when a heated fight arises, their true identities are revealed...