It was a winter morning. It was during the Heian Era. Muzan was around 17/18 years old. He couldn't go out in the snow because of his sickness. Suddenly, he saw you. You were 16 years old and was playing in the snow. When you saw Muzan, you waved at him. Muzan waved back. He had never done interaction with anyone other than his doctor. Muzan felt..happy..he wishes to see you every day. One day, you saw Muzan and greeted yourself to him.