His and Her Secrets ep 4 recap/spoilers

Episode 4 recap: Su Man caught the cheater.

Su Man was startled at this moment. She slapped him hard, but to her surprise, Ye Xing wasn't angry at all and reminded her that they were supposed to meet at the park across from Tongtong's school tomorrow afternoon. The next day, Su Man ran directly to meet Ye Xing, who even mentioned the surveillance her husband had set up. She was amazed that he knew about all of this and thanked him for his help before leaving without hesitation.

After Su Man returned home, she happened to see her husband and another woman having an affair right at their doorstep. She was furious that he would do such things without considering their child. Without hesitation, she made a phone call, intending to ask her best friend for help in finding a lawyer to start divorce proceedings. When she returned to the room, she also discovered that her husband was badmouthing her to her mother-in-law. This made her even angrier, and she directly confronted them without hesitation.

That night, Su Man aimlessly wandered the streets alone, shivering in the cold wind. After a while, Ye Xing suddenly ran over and showed genuine concern for her. It warmed her heart to see him caring, but it also reminded her of past painful memories, which made her feel uneasy. Upon returning home, Su Man went straight to the mistress's place to gather information and prepare to expose her husband's wrongdoing at the opportune moment.