Shangguan was attracted to this child when he met Mo Mo for the first time. He couldn't see it. He had not yet emerged from the haze of autism at the age of seventeen. He was alone and only played with himself. Oh, and there was the doll Wai Wai in Mo Mo's arms.
When Shangguan saw Mo Mo, he saw a similar version of himself before, and a feeling that he must take care of Mo Mo sprouted in his heart.
In Mo Mo's world, there is only Wai Wai. Shangguan devoted all his patience to playing the role of Wai Wai, the doll in Mo Mo's arms. He got closer to Mo Mo step by step and made Mo Mo the only one in his life. Never give up.