Six years ago, Xu Jingchuan had no choice but to leave to care for his seriously ill elder daughter, separating from his younger daughter. After an accidental mix-up in which he picks up the wrong child on a rainy day, he reunites with his amnesiac ex-wife, Shen Zhiyi. Their twin daughters finally recognize each other as sisters, while the hidden truth behind the car accident six years ago slowly comes to light. Old feelings between the two begin to rekindle, but past misunderstandings and emotional wounds remain. As they learn to overcome their differences and understand one another, they join forces to protect their two daughters and gradually discover whether they can become a happy family once again.