Boss Zheng likes to drink.
He loves it so much that when he drinks, he likes to make others play drinking games with him.
Ali always accompanies him in drinking and playing these games.
Ali is good at these games, but constantly being bombarded like this is a bit much even for her.
Moreover, Boss Zheng likes to get handsy with the ladies at the nightclub, and Ali has had her fair share of unwanted advances.
It was already 2 AM.
Ali finally managed to get Boss Zheng and his two friends drunk, but she wasn't in much better shape herself. With unsteady steps, she groggily made her way out. If she didn't do this, she'd probably have to stay and sleep with Boss Zheng tonight, and right now she really didn't want to entertain any guests. She wanted to be clean, even just a little.
She endured the discomfort in her stomach all the way back to her office.