help me to find this story (bl probably)

ok, i saw this vid on tiktok where there was a red long haired guy and his arms and legs are chained up so that he was struggling to be freed and later on there was this white haired guy suddenly show up crawling because he gonna get his other pair of shoes in the front of red haired guy. after he got his shoes he turned his back but he got concerned on the situation of the red haired guy so he sang a lullaby to calm him down. then after that the red haired guy lose his consciousness and his hair became black. i think the red haired guy was a "phoenix" as far as i remember.

pls i badly need your help and sorry for my poor english. thank u!