An unexpected reunion opened up old wounds that had not healed for three years.
When Gu Yusen transferred schools to take care of his family and tried to start a new life, he never thought that fate would deal him such a ridiculous blow - in the teacher's office, he met his first love Jiang Xubai, whom he had not said goodbye to three years ago.
The former lover has now become his biological sister's class teacher.
At the moment of reunion, the pen in Jiang Xubai's hand pricked the cracks in the homework book, which was like a symbol of the irreparable relationship between them. The cold eyes, the business-like tone, and the home-school contact book that was torn to pieces on the spot all declared hatred and determination. "Waiting for you to tell the truth" that Jiang Xubai wrote in his textbook three years ago has now become the sharpest ridicule.
On one side is the "brother" who is the innocent and dependent sister, and on the other side is the cold and distant "Teacher Jiang" from her ex. Gu Yusen is trapped in the identity of "student parent", struggling with guilt and helplessness. Jiang Xubai, on the other hand, is repeatedly torn between the reason of being a role model and the resentment of being abandoned.
Can this past incident that started in midsummer and was frozen in the cold winter find any possibility of reconciliation in the fettered reality? When the closest family members become the most painful bond, will they move towards deeper entanglement or a complete breakup?
Purpose: Love requires courage, and truth is the starting point of redemption.