HELP ME FIND THIS BL PLS

I read this quite awhile back do my memory is spotty but here is the fust
>mc is some kind of assassin/hitman from an organization
>mc uses a sword
>>iirc he has some trait that the ml hates??? like someone w the same trait killed someone from ml’s past
>mc hid that trait but when he was about to get exposed he decided to just kill himself to hide the truth??
>mc was about to off himself with the sword in the last bc bcs he thought that the mo would kill him eventually

>B/W MANGA
>YAOI
> This has EN tl