I have a theory! In one chapter Taegun's friend said that there is a rumour that Eunsung could shut someone's power down or something like that. I bet it is true and he is going to use it against that piece of shit pervert.
The sister and the ML are crazy. Why the hell would they get married? I mean the sister was just delusional but why would the ML go through with?! Make it make sense!
I hope she can wish the water damage away