Suggest

I'm also looking for one so I'm gonna camp here

Can't think straight

https://www.mangago.zone/read-manga/form_of_sympathy/ - ML had to rebuild mc’s mental health from scratch and have a chasing arc
https://www.mangago.zone/read-manga/the_third_ending/ This one was so cute and the angst isn’t so severe but I felt so bad for the uke, one of the best redemptions/chasing arcs in terms of the seme actually redeeming himself

https://www.mangago.zone/read-manga/the_world_without_you/ This one was so angsty omg

https://www.mangago.zone/read-manga/night_by_the_sea/ Warning this was EXTREMELY toxic, but the regret and chasing arc was good, I still reread those parts sometimes but be warned it takes along time to get to that point and mc is practically living in hell till then