Episode 4 recap: Bai Lan helped Lu Xiao Lu catch the hooligan.

The exhibitionist reappeared, and everyone in the security department reminded the female workers in the factory to be cautious as usual. Bai Lan specifically went to the factory manager to inquire about the time the exhibitionist appeared. During that time, Lu Xiao Lu was with Bai Lan, which proved that Lu Xiao Lu was not the hooligan. It turned out that Lu Xiao Lu had been wrongly accused before. The factory manager said that he had watched Lu Xiao Lu grow up and didn't believe that Lu Xiao Lu could do such a thing. However, solving the case couldn't rely solely on imagination. Bai Lan understood this and knew that they needed to find the real hooligan to prove Lu Xiao Lu's innocence.

After getting things in order, Bai Lan went out for a walk in the street at night again, and sure enough, the exhibitionist appeared behind Bai Lan. Bai Lan confronted the exhibitionist, and unexpectedly, Lu Xiao Lu also showed up. In the end, the exhibitionist ran away, and Lu Xiao Lu got injured.

Bai Lan helped Lu Xiao Lu treat the wound. Lu Xiao Lu kept complaining about the pain, but after Bai Lan said a few words, Lu Xiao Lu stopped. When Bai Lan turned around, they noticed that Lu Xiao Lu's buttocks were also injured. Bai Lan immediately offered to help, but Lu Xiao Lu felt shy and said it was something they wanted their future spouse to see. They even joked that they would rely on Bai Lan. Bai Lan looked disdainful and said they had seen many buttocks as a doctor, so should they be responsible for each one? Lu Xiao Lu fell silent.

Bai Lan brought up the exhibitionist again and suspected that there were two different individuals. The recent exhibitionist didn't have much muscle and had a soft body, while the previous hooligan was muscular and strong. Lu Xiao Lu interrupted, saying that the reason Bai Lan misunderstood them as the hooligan before was because of their muscles. This diverted the topic, and Bai Lan rolled their eyes in response.

The next day, Bai Lan took the discarded condoms dropped by the exhibitionist to find an elderly person in the factory. The person was initially startled but then told Bai Lan that the family planning supplies were usually kept with Chairman Zhao and mentioned that Chairman Zhao was a good person whom everyone trusted.

Chairman Zhao is Lu Xiao Lu's mother. Before Bai Lan went to find them, Lu Xiao Lu went back home first. Lu Xiao Lu's mother was playing mahjong, so Lu Xiao Lu went to their room to tidy up their clothes.

Soon after, Bai Lan arrived. Bai Lan exchanged a few words with Chairman Zhao and was surprised to find that the family planning supplies were casually placed in the house without any distribution records! It would be extremely difficult to investigate this. Bai Lan mentioned that they would move the items back to the medical room in a few days. However, Chairman Zhao felt that Bai Lan didn't trust her and became angry. Lu Xiao Lu, who was in the room, became worried upon hearing this. As soon as they heard Bai Lan leaving, they quickly followed.

Lu Xiao Lu saw Bai Lan alone on the rooftop and immediately pulled them down, afraid that Bai Lan might have suicidal thoughts. However, Bai Lan said that no one wanted to stay alive more than themselves. During their conversation, Bai Lan seemed to see a man from the administration department bullying a woman, but they disappeared in an instant. Lu Xiao Lu thought Bai Lan was making excuses to reject them, but Bai Lan bluntly stated that they didn't need a reason to reject them! Lu Xiao Lu persisted and later invited Bai Lan to their brother's newly opened ice skating rink, but Bai Lan remained silent.

On the day the ice skating rink opened, Lu Xiao Lu didn't see Bai Lan at first and felt a bit disappointed. However, soon Bai Lan appeared like a beam of light, instantly brightening Lu Xiao Lu's world. During the ice skating competition, the two of them skated side by side, and Lu Xiao Lu was very happy. Qin Juan, who was behind them, became anxious and accidentally bumped into Hu Lao Da (Boss Hu)! Of course, Hu Lao Da wouldn't let her off easily, and the Lu Da Jiang (Lu's Big River) side also had a strong presence. Soon, both sides started spraying each other with fireworks as a form of playful retaliation. Lu Xiao Lu and Bai Lan laughed, and after exchanging glances, they walked through the fireworks, creating a magnificent scene! In the evening, Lu Xiao Lu accompanied Bai Lan back home. Li Ke Nan realized that Qin Juan didn't like him, which made him very distressed. However, Lu Xiao Lu mentioned that he would keep pursuing Qin Juan, and if he couldn't catch up, there was always Niu Xiao Ying. Suddenly, Niu Xiao Ying appeared and brought food for Lu Xiao Lu. Li Ke Nan instantly started teasing Lu Xiao Lu about Niu Xiao Ying.

While they were playfully teasing each other, they were unaware that as soon as Bai Lan returned home, they discovered a threatening letter! The next day, Bai Lan told Lu Xiao Lu about it, and Lu Xiao Lu immediately posted the threatening letter at the lost and found area. Then, the two of them hid in the dark and observed. It started raining, and finally, someone came and tore down the threatening letter! Surprisingly, it was a girl!