Don't tell Ji-ho? Bish.... don't u remember that he listened to the whole conversation? Do u rlly think that's a dream or some sheet?? Well maybe u can transfer instead of dan-i now, u will never be able to recover from this situation anyway, lol
@rizuna in the conversation that she had with Dan-I on the roof they didn't say that she was the one who created the cafe. So, she assumed that he only listened to that conversation without any prior knowledge of this matter is her doing. That is why she asked Ju-In to not tell Ji-Ho about it, thinking he doesn't know the whole picture.