Qi Pei, who was involved in a school violence incident, returned to high school to repeat his senior year. When he returned to his senior year, Qi Pei met Song Yu, who had serious "idol baggage". Song Yu was still upset about the car robbery incident one night, and had not wanted to see Qi Pei. However, Qi Pei didn't care and kept playing the role of an older brother, taking care of Song Yu. Song Yu slowly reciprocated Qi Pei's care and returned to protect Qi Pei. As day goes by, the two gradually grow up and lose their childishness (especially Song Yu), and their intersection gradually deepens, and finally they become irreplaceable existences for each other. Cold, Cold and Cool Song Yu × Gentle and Soft Qi Pei