Neurosurgeon Xu Sui reunites at the hospital with Zhou Jingze, her college sweetheart. A misunderstanding surrounding their breakup five years earlier still stands between them. When the truth comes out that Zhou Jingze was forced to break up with her to save his father, they try to rekindle their old romance, only to face a series of trials involving the aftermath of a car accident, secrets, and amnesia. After eight years of devotion and waiting, the moment Xu Sui's memories return, she chooses to let go of the past. Their long-delayed confession ultimately becomes an unforgettable regret from their youth.
