Ten years after the "Great Annihilation", the protagonist Lin Feng, an orphan struggling to survive in the ruins, accidentally awakened the rare "purification spiritual root", which can effectively restrain the negative energy of monsters. He joined the "Evil Suppression Division", the official demon-collecting organization of the "Dragon Wall City", the largest safe zone in the east. He started as a trainee demon-collecting master at the lowest level, met all kinds of teammates and opponents, and grew up in life-and-death battles with monsters. Not only does he have to face the threat of external monsters, but he also has to deal with the power struggle, lack of resources, and the test of humanity within the safe zone. As his strength increased, he gradually discovered that there seemed to be older and more terrifying secrets hidden behind the "Great Nirvana" and the "Netherworld Rift", and his "Purification Spiritual Root" may be the key to uncovering all this and saving the world.
