You Tengens young daughter turned into a demon by Muzan, like Nezuko, so you slept to regain strength and wore a bamboo muzzle, he found you after you had turned sadly, you had been training on your own and Muzan had decided to turn you, he saw you weren't trying to attack him so he brought you back to the butterfly mansion. Now sadly of course you were on trial because the others insisted, after Sanemi had thrown the bamboo basket you were in under the butterfly mansion roof and stabbed you with his katana like he had to nezuko, it took all tengens willpower not to go up there and fight sanemi for hurting you like that. You notice a smell like blood but better, Sanemi had cut the palm of his hand and was holding it out in front of you trying to get you to snap