An all girl clan vs an all boy clan where they can never get married due to some ancient hatred and I know you are thinking oh wait how do they get new members?

By ep 9 villain female comes out trying to kill 2 clan heads (who are in love and decided to leave the clan to get married). Both clan present and just watched!
And then you are thinking oh can't they all just tell her the truth before fight started? I mean there was a lot of dialogue already.
Can't both clan just gang up on ONE single female villain and call it?

This kind of story writing is painful to watch.....