“Good yaoi” and “toxic seme” being in the same sentence actually made me cackle (I ain’t judging lmao). I’ll give you some links for ones I’ve read before, though some of these I didn’t really enjoy much. Obviously this is really subjective, so it’ll be up to you what you consider “good”. Generally if you want to look for a toxic ML, look for anything tagged with “Cinderella plot”, I know some people even have lists for it (check out being-you, they have lots of good lists).
ML is really toxic first season (it’s ABO+gangsters+cinderella plot), but surprisingly second season has done a really fantastic job of redeeming him.
https://www.mangago.zone/read-manga/night_by_the_sea/
Another ABO. ML sucks, only thing keeping them together is well…if you haven’t read it yet you’ll find out
https://www.mangago.zone/read-manga/love_is_an_illusion/
ML for this one is actually insane. He keeps MC prisoner bc he’s so obsessed despite MC having trauma…it’s kinda sad actually.
https://www.mangago.zone/read-manga/even_if_you_don_t_love_me/
Honestly…this one is kinda good. Once the series returns for Vol. 2 you actually kind of want to root for their relationship.
https://www.mangago.zone/read-manga/hitsuji_no_kawa_wo_kita_kemono/
Cinderella plot
https://www.mangago.zone/read-manga/limited_run/
ML literally just hates MC guts.
https://www.mangago.zone/read-manga/how_to_survive_as_a_player/
Here, you get *2* toxic love interests for the price of 1
https://www.mangago.zone/read-manga/stuck_in_my_sister_s_dating_sim/
ML (Sehyuk) is a walking red flag…like bro is literally a gangster…but I actually love him.
https://www.mangago.zone/read-manga/mad_dog/
Here’s a list for more Cinderella plot yaoi’s:
https://www.mangago.zone/home/mangalist/304704/
Any good yaoi recs with toxic semes like jinx?