Qi Yelu is the school idol that the whole school looks up to. He is as cold as frost, but he is particularly indulgent towards the transfer student Shen Shuyu. Shen Shuyu thought that she was the substitute of the long-gone Bai Yueguang in the other person's heart. She endured humility and silently endured all the tenderness and indifference. Until that day when it rained heavily, he saw Qi Yelu kneeling under the cherry blossom tree in the old playground, clutching a faded hair tie that he had thrown away three years ago, and Qi Yelu's fingertips were kissing it tremblingly. It turns out that the substitute he mistakenly identified was never him. It was him, the shadow forgotten in the rain.