Lin Zhixia was an orphan who, as a child, gave her beloved doll to the heartbroken Zhou Chengyu. The boy promised they would stay together forever. After a car accident left her mentally impaired, she was taken in by the Zhou family, only to be rejected by Zhou Chengyu years later. One rainy night, she ran away and unexpectedly encountered Lu Jingshen. The Lu family lovingly supported her and helped her recover through medical treatment. Following the clues, they uncovered the truth behind the car accident: Zhou Chengyu had been responsible for the accident and fled the scene, spending years keeping watch over her in an attempt to atone for his guilt. Zhixia finally let go of the past. After recovering, she made her own choice and embarked on a new life with Lu Jingshen.