FL and ML's relationship is definitely somewhat toxic

Are there any dramas where ml and fl's relationship could definitely considered toxic. 

no im not talking about the spoon-fed idea of toxic where the bf beat the gf up or the gf abuses the bf. 

but like , theyre toxic for each other,  one trope could be that theyre exes and cheated on each other or brutally broke each other's heart, definitely are not healthy. something like that

any country any language will do 

Toxic but not ohysically abusive

• Nevertheless
• Tempted
• My Sunshine
• Temptation
• Love and Fortune
• Discovery of Romance
• Hirugao / Love Affair in the Afternoon
• Que Sera Sera
• Scum's Wish

• Kakafukaka 
• The World of the Married 
• Bulgasal: Immortal Souls ( I guess this could be described more as ill-fated rather than toxic depending how you look at it)
• It's Okay to Not Be Okay 
• Story of Yanxi Palace 

• The World of the Married
• My Name
• Love Alarm