I'm getting annoyed with Yeoryeong. Even if she doesn't necessarily view Eun Ji-ho as a friend, she should still understand him as friendly. But she is so quick to be violent against him.
And it's supposed to be played for laughs. Because this is a South Korean work, and violence by females against males is so funny. Especially unjustified violence, like here where she slaps him in the face.
She's kind of an ass because of this.