Read manga: I Will Just Stick To The Protagonist

Manhwa
Summary:

She got possessed in the body of the fiancée of the crazy protagonist who plans to kill everyone. I was going to live a quiet life away... but the male lead keeps showing interest. Furthermore, even though she is young, her beautiful face is already stunning..."Did I do well? Then go ahead and praise me."Don't suddenly pretend to be friendly, are you crazy?