need to find

im looking for a bl manhwa i dont remember much but basically the mc was like serving and working for this guy his whole life as a way to help his brother who doesnt know he exists and like ml uses mc as an ashtray to the point he lost all feeling in his tongue and in the end -------------------------------------------------spoiler -----------



we find out that he wasnt even his real brother so it was all for nothing but he still continues to do his job becz atp it doesnt even matter