On the first day Jiang Yu transferred to another school, he was dragged to the rooftop by the school bully Li Xiao and asked in a cold voice: 'What are you doing back here? ' He thought he was a substitute, but the truth was—he was not that person at all. When Su Tang handed over a half-burned photo late at night, Zhou Ye thrust a bloody audio tape into him in the corner of the boxing gym, and Chen Huai's old medical records began to flip through the pages. Li Xiao finally collapsed: 'It turns out that I hated the wrong person and loved the wrong person. ' And Jiang Yu is standing on the edge of the truth, watching how he transforms from a substitute into a savior.
