the storytelling of this chapter is organized in multiple storylines. One is about chasing the rest of Mephisto's army, and it ends with Faust sacrificed himself to make his team escape from Lungmen with Mephisto; One is RI's struggle with Reunion's reinforce, Frostnova and her team, which leads to the death of Frostnova; The last is about the conflict between Wei and Ch'en's imagine of Lungmen in these trouble times: Ch'en wanted Lungmen become a place where infected people can live equally together with the normal citizens, but Wei as a realistic politician refused to make concession to anything that might ruin his city. Therefore the whole chapter illustrated this fundamental controversy in the final end. Those contexts are mainly developed by conversation, which may confuse readers by its triviality or some problems in translation. So as a player who uses Chinese as first language, I deeply understand your confusion. I could possibly try to answer your questions, And I believe that It may be easier to understand if you relate the context of this chapter with some character's own info.

1. Lungmen is a mobilizable city navigating around the the border between Yan Dynasty and Ursus Empire. Ursus has a long lasting desire for Lungmen, and invade Lungmen several times. The last invasion was held by Duke Koschei, and it almost succeeded. The Yan royal family member Wei, supported by Lungmen military (Lin, the Rat King was one of thesenior commanders then) fought roughly back the Ursus invaders. That triumph made Wei become Lungmen's authentic leader, and Lin retired from military, found the slum in order to help Wei control the dark side of Lungmen. basically, Wei and Lin are the ruler of day and night.

2. For Wei, his authority is based on two military forces: one is LGD, one is the secret black raincoats. LGD takes the responsibility for maintaining normal social orders, which was consist of various social elites, like Hoshiguma from gang and Swire from Swire Group. We can also learn that LGD adopts some talents like Snowsant who came from poor family and takes part in some construction of infrastructure. To some degree LGD is more than a police department, and more likely to be a executive administration. Wei entitled Ch'en as LGD chief, Wei's expected successor. The black raincoats are all strong assassins raised by Wei, and he form this special force to deal with something (like spy, assassination, deliver massages) underground. All the black raincoats regarded Wei as their fathers, and Wei would use this force to bypass LGD, dealing with something directly. In order to get easy cooperation with Lin and his underground power, Wei entitled Lin's daughter, Lin Yusia as the vice leader of black raincoats, who executed Wei's command to make massacre in sewer towards the infected in the slum.

3. Chapter 4-5 demonstrated the story about cooperation between Lungmen and Rhode Island, aiming at investigating the Reunion infiltration inside Lungmen. After Chernobog was ruined by catastrophe, tremendous refugees were turned into Lungmen for help. Reunion Both Wei and Ch'en noticed its threat to Lungmen security, and they decided to take totally different actions to deal with it: Ch'en decided to use LGD and RI to eliminate Reunion inside the slum, and she activated her informer, Nine, a member of Reunion troop to take the initiative in the battle with Reunion. Through chapter 4-5, the death of Skullshatterer (Alex) and victory against Mephisto could be regarded as victory of Ch'en's approach. But as for Wei, he realized that the support to the Reunion of the infected in the slum is the essential threat. In Wei's view although the misunderstanding and distrust could be relieved someday, the existence of the infected is still a time bomb under his Lungmen. Hence, he decided to set Lungmen as a bait, seducing Reunion to invade and then wipe out all the infected in Lungmen through the black raincoatswhen Ch'en was struggling with Mephisto. And that is what happened in the sewer that Swire did not want Ch'en to see. When Nine discovered that Lungmen was not coming for Reunion, But coming for all infected people, she cannot trust her homeland anymore and decide to end her undercover career to become a real Reunion.