Episode 4 recap: Mo Lin Lang works for He Yi Jing.

Mo Lin Lang woke up early in the morning and couldn't help but complain about getting up too early. Seeing Mo Lin Lang's indifference to her crude behavior, He Yi Jing felt that she was not afraid of her at all. Mo Lin Lang confidently brought up the promise He Yi Jing made to her yesterday, that as long as she didn't act, He Yi Jing would spare her life.

He Yi Jing earnestly declared that her words were as solid as gold, and whatever she said, she would definitely do. Mo Lin Lang quickly smiled and said she was just joking, while quietly calling He Yi Jing a despicable person. He Yi Jing, who was skilled in martial arts, overheard Mo Lin Lang's comment.

Mo Lin Lang was very noisy, and He Yi Jing couldn't tolerate her disrespectful behavior towards others. He kicked Mo Lin Lang off the carriage. When Mo Lin Lang saw that He Yi Jing had actually left, she quickly apologized. He Yi Jing instructed Mo Lin Lang to go with Fu Feng to find clues.

Fu Feng reported to the prince that they found a sick pigsty on the mountain. After questioning the caretaker, they found the person who transported the sick pigs down the mountain. Mo Lin Lang added that the person found a human thigh bone near the garbage heap in front of the wax dyeing workshop after delivering the sick pigs, and then sold it along with the pig meat to the butcher. When He Yi Jing heard about the wax dyeing workshop, she realized it was related to the third prince's business and decided to investigate tomorrow.

Mo Lin Lang wanted to sneak away, but He Yi Jing threatened her, forcing her to retreat. The three of them disguised themselves as masked black-clad individuals and arrived at the wax dyeing workshop to investigate the clues. Mo Lin Lang found a mechanism and discovered a person locked inside a secret room, barely clinging to life.