So his teacher's girlfriend is her sister?? There'll be a lot of unnecessary drama again?? And probably he's gonna fuck her girlfriend, make her preggy have a 200+ character development in their relationship, then a plot twist happened, the guy didnt know that his sister loves him all the time. She's gonna be in an accident, the girlfriend will realized that the sister's love for his brother is much stronger than her. They gonna split up, the guy will end up marrying her sister.
Then Boom Happy End.
Naaah im just trolling.