Toxic relationship BL manhwa without S/A?
The Promise
https://www.mangago.zone/read-manga/the_promise/
A Link Between Relationships
https://www.mangago.zone/read-manga/a_link_between_relationships/
Circle Trap
https://www.mangago.zone/read-manga/circle_trap/
BL where the second lead actually wins
One of my favorites:
https://www.mangago.zone/read-manga/the_god_of_pain_s_groom/
GAWDAMN