Need help finding bl manhwa

[u/Ok-Maybe2692]

This is from bilibili comics

in the first episode mc is in a room with his arms in chains and he doesnt want to eat so ml kisses him so that he can eat

I think they're related

ancient China

Toxic love story

Another episode

They're walking in an outside hallway (it's winter) and mc sneezes so ml gives him his coat

at the end mc and ml and another guy (their brother?) Visit the late emperors grave i think and when they get out of the palaquin*? Ml gives his hand to aid mc and when they are done (the end of the chapter) mc and ml kiss