One.

AKA Five Times Chan sang the others his childhood lullaby, and one time he had it sung to him.

This is inspired by Seungmin's Small But Certain Happiness Ep. 7, when it was like 4 am and Chan and Seungmin were talking about lullabies and Chan had one he thinks his mother may have made up. He said that he had sung it to the other members but none of of them had ever heard it before. Anyways, the idea of Chan singing a lullaby to the members was too adorable to pass up, so here we are.