I don't remember much, but it's a yaoi manhwa with incubus (?) MC or something like that.... The MLs are angels and the three end up in a marriage together? The angels are high rank ones meanwhile the MC is the low rank.
This one maybe?
https://www.mangago.zone/read-manga/can_angels_do_this/
Is this a happy, bittersweet (but they end up together), OR sad ending?
personally i think it has a pretty happy ending
happy