Even though he hadn't disclosed any information about his identity, his words were quite selective and therefore very misleading. The girl probably didn't expect that apart from herself and the client, anyone else would know she was coming here tonight and exploit that.
However, since he hadn't said anything, even if he got exposed later, he could explain everything away as a misunderstanding, like he was waiting for someone else at the time...
Of course, he'd likely never need to use this excuse, because as soon as the mission was completed smoothly, he was ready to flee and disappear. No explanation would be needed if he couldn't be found.
Of course, there was probably a very important reason things were proceeding smoothly —
The girl couldn't speak, so she wasn't able to ask too many details.
Moreover, since it wasn't really a major issue, after Gu Mo misled her, she naturally arrived at that conclusion.
