She remembered that she had fainted in the arms of the Night Timekeeper. She was with the Night Timekeeper, so there was no doubt that the person who was with her last night had to be the Night Timekeeper.
Even if they had agreed on marriage and had nothing to do with love, it was impossible for her to hand her over to another man. Thus, the only possibility was that it was Ye Sichen.
However, she and the Night Timekeeper had an agreement of marriage. The person that the Night Timekeeper loved wasn't her, so under normal circumstances, the Night Timekeeper wouldn't touch her.
She suddenly recalled that He Tongtong had said that she would act indecently when she was drunk. Thus, there was only one possibility that she thought was that the tragedy from five years ago had happened again.
Five years ago, she was drugged by someone and 'exerted' Mo Yan. But today, she 'exerted' Night Time Chen because she was drunk.