yeah as someone pointed out before, while i kinda get the point of the twins, especially if we think about that they all live in south-east asian, so normally they would have to learn for exams etc. 24/7, the point is (now) both of them are in love with him and they (probably) want kids at some point, where its just impossible to hide from him anymore (if not one of the twins says goodby before this), so its just weird that they made no plan how to talk to him once the secret is lifted...