Ten years ago, the little brother next door had a secret crush on Liu Yihan, but in a blink of an eye, his sister, who had always been indifferent to him, came to his school as a teacher. He thought that their fate was over and there would be no chance of a relationship. Unexpectedly, just when he was about to pursue his sister passionately again, he received the news that his sister was in love with his classmate. He instantly didn't know where to go and could only shut himself in a small room and rely on childhood memories to lick his wounds. He thought he would be like this for the rest of his life, but unexpectedly one day, a bright light suddenly lit up behind the closed door, making him confused and unable to see who was coming.
