"I love you. This is not based on the fact that you love me too. Even if you forget me, I will always love you."
They parted ways due to conditions, and Duan Mingxian was assigned to work in a company after studying in college. Here he met a boy who looked very similar to him - He Lian. He once thought of him as him, until they met again. He couldn't tell who they were, but he knew that he only loved him.
Concept: Setting from a long time ago