Just like what Jin Mingze expected, the room where Ye Shuxin went was close to the room that Zhu Yuehan and Mo Han were.
He saw Nai Yuge and her friends entered the room and they quickly pushed Zhu Yuehan away, stopping him from further taking advantage of the naked woman on the bed.
Zhu Yuehan hasn't really taken everything further since they came too early. He actually just finished undressing Mo Han when they caught him.
It so happened that the '483' that Ye Shuxin sent Nai Yuge was the room where Zhu Yuehan was. She could have just left it out so that Nai Yuge would have a hard time looking for them but she didn't. Maybe somewhere inside her, even if she wanted to become so cruel, she didn't want Mo Han to be totally raped by a bastard like Zhu Yuehan.
She calculated the timing and it was enough to scare Mo Han off before she could be saved by her friends.
"Bastard!"
"Beat him up!"
"How dare you!"