Mu Huan's idea was to mess things up — mess up and destabilize the douchebag's life!
The scumbag had a good job. He was the manager of a major company. Due to his career, girls naturally believed that he was definitely not a liar.
Mu Huan first exposed the scumbag's marital status to his company, letting the female coworkers he was dating find out that they had been cheated on and having them cause a scene. Thereafter, she hired a few more women to pretend to be his girlfriends and had them take turns to stir things up at his company, plaguing him with endless scandals.
When the douchebag had asked the security officers to prevent female strangers from entering, Mu Huan disguised herself as a pregnant lady to cause a scene at his company. As she was pregnant, the security officers did not dare to stop her as they were afraid to cause any incidents.