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Qingze is a paradise that chooses to escape from the world. Very few outsiders can find this place. The most mysterious thing about Qingze is that they have a method that is not spread to the outside world. It is called "Yuan". The "Yuan" method is said to be quite mysterious. People who are subjected to "Yuan" will completely obey orders and never betray. This is coveted, especially for some special organizations. The search for "Yuan" has not stopped for a moment, and finally they have found a clue. "Yuan" may bring another bloody storm...