The sister is just annoying at this point. She doesn't need to be added of this is only for comedic purpose. Maythan already plenty of things to think and work to make the stroy progress.
i understand why sanho is acting the way he is, from the start it's clear what sanho wants before this happen between him and tak. He just want to be in a relationship with someone. It seems childish on how sanho expresses himself but, tak take advantage and gave mix signals which is very infuriating. They are going back to square one, TAK should just make it clear to sanho if he wants him or not.