Did Xia Shu admit to doing those things, or was there any evidence to prove it?

Xia Shu didn't dare to face Tuohai, just because he was alone with that man. They have been to the hotel, they have been to the hotel. So, what happens if men and women stay alone for one night and don't do that? They may be able to chat among their peers, but if they chat, they need a room, and they need a night? And Japanese culture is like this. Women are more open. Xia Shu was stupid at first, but he was cheated by that man!