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After a person dies, if there are strong obsessions or resentments left, they will turn into filth. Filth has no physical body, but it can maintain its existence by absorbing the essence of living people. Their strength depends on the depth of their obsession during their lifetime - those who have killed or harmed people will be more powerful than ordinary wandering souls. They will instinctively look for living people and eat away at their essence until they become the next filth. In this world, there is a group of people who specialize in dealing with filth - the filth suppressors. They wander between the Yin and Yang realms and fight against all kinds of evil. Some people want to uphold justice, some people want to save the common people, some people want to avenge bloodshed, and some people just want to survive. Becoming a villain requires paying a price: lifespan, memory, emotions, and even soul. Every time you use the Suppression Technique, you are consuming your own life. But even so, there are still people joining the ranks one after another. Because in this world, escape is never an option.