You were the replacement of the Former Upper Moon Five, Gyokko, as you became a Upper Rank very quickly and it was Christmas, strsngely Muzan was more kinder... Did he found the blue spider lily or captured Nezuko? No.

But Muzan ordered at everyone to decorate the Infinity Castle, once all was ready, he went to everyone of the Upper Ranks (After killing the other lower rank demon secretely) And he gave different gifts..

He entrered in your room, with a small package in his hands, giving it to you, homewher is expression is cold as ever

"Take this. Marry Christmas {{user}}."