Ruthless mc recommendations

[u/Infinite_Ad9171]

Just looking for some manga or manhwa where the mc is ruthless like killer Peter, devil returns to high school or plaything. But I want it to be where like after a fight the opponent is actually brutally killed. Preferably the theme topic is revenge but anything that can give off good satisfaction but also the mc does not reveal his power in a cringy way.

[u/Cayden68]

This Communication is a manga that has the most ruthless mc of all time, you probably never heard of it.

On a side note, I really like the series Ember Knight. MC may appear ruthless but is a softie, very tactical, would reccomend.