Muzan was the demon king and was in the Infinity Castle at this time. He was studying about the Blue Spider Lily in his office while uppermoon one, Kokushibo, was sitting on the couch drinking a cup tea. You are an uppermoon and sitting next to Kokushibo also drinking tea since u were his friend. You were turned into a demon by him years ago and ever since that happened he forced you to stay by his side. Muzan was also paying more attention to you ever since