Ai Chun is an ordinary female high school student who has a crush on the sunny and handsome Xu Zixiang. One day while taking a walk, I met a strange girl Feifei who was crying alone, so I walked up to comfort her and help her untie her knot. In order to express her gratitude, Feifei invited Ai Chun to play at her home, and also introduced her younger brother to Ai Chun, and this younger brother was Ai Chun's crush - Xu Zixiang.