Hi guys i'm new here, i wish i'll get many response from you.😁 😁 Please recommend me manga/manhwa/webcomic with psychopath male lead who fall in love (there is romance). I prefer happy ending romance/ they end up together. Here are some examples:

1. Bastard
   https://www.mangaupdates.com/series.html?id=123301

2. Cheese in the trap

3. It's mine
   https://www.mangaupdates.com/series.html?id=153168

Raise wa Tanin ga Ii
Sensei no yasashi koroshi kata
Iyagatteru Kimi ga Suki only has one chapter translated but I've browsed the raws and let's just say things get really crazy really fast.

None of these are complete, so idk about happy endings. You might want to check out the Psychopath/s tag as well.