Its an addiction's activites

New Omega mother Tatsumi snaps at the yakuza Ryuuga and catches his interest. Cajoled and pampered&h...

I spent a carefree day lounging about after paying off my tuition loans, but ended waking up inside ...

He's rich, he's smart, girls gather around him all the time, and he has always gotten first place on...

The daughter of the Daites Province's Duke, Milliana, had enjoyed her previous life in modern J...

I’ve always been a little bored with kind, heroic main characters, especially those that refuse to kill anyone. It’s just a bit boring. So, I made a list of Mc’s without those morals

 - absolutely evil MC, through and through.
 - MC wasn’t evil at first, but something happened to him/her that made him/her a the way they are now.
 - pretends to be nice and innocent.
 - MC is emotionless when killing, and seemingly show no emotion/remorse.

This list includes links to WEBTOON,

Crown prince Cecil was so brilliant that everything in life was easy to the point of boring him, the...

This manga got similarities yet the plot is quite different from each other. My Fav! This is in a random order. I will update in as I come across more similar manga which I like. 

EDIT: Thank you! I never thought the list I created cause I was bored will get followed by 3k+.. Glad to know we got similar taste in manga~ :)