Le Jun Kai (2013) - https://kisskh.at/6431-le-jun-kai
This is toxic romance at its finest. Don't let the low rating deter you, because most of the bad ratings/reviews cite the toxic relationship between the leads as the reason for the low reviews. The acting is solid from the leads. It's a short drama, so there's not much time for character development, but the cast make it work.
Secret Love/ Secret (2013) https://kisskh.at/7761-secret
Toxic romance and abuse, but the stellar acting from the main cast has you rooting for them to have an HEA.
+1 on Summer's Desire (2010) https://kisskh.at/209-summers-desire
Another great drama with toxic relationships. Barbie Hsu slays in her role.