The master tells Dudu to go ahead and look for the green fog. Dudu promises to be obedient. The master explains that the fog is caused by the release of the green liquid from the rainbow grass. The green liquid is a natural gas that can be used to create bridges. Du Du promises to obey the master. They go to find the rainbow liquid. The man in black tells Du Du to grab the liquid and burn it. The young master asks Du Du if he is tired of watching. He says that the girl really has the ability to use the liquid to make bridges. He tells her that she must pay them for ruining his chance of finding the liquid. He asks her if she wants to offend the royal family at the residence of the pingnan. She replies that she does not want to offend them. She says that she spent the night searching for the liquid, and the men ruined her chance of discovering it. She asks the young master if he wants to pay her. He replies that he does not, but that he will let her go this time. He looks around at the man who finally left and wonders where he is.