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I got this badge from an old man. Through the badge, I walked into this mysterious circle and saw an unknown side of the world. In my heart, "mmp, I don't want to come at all. You didn't trick me into coming here."

4 years ago, I witnessed the death of my friend Zhang Xinyu. In order to catch the murderer, a friend and I applied for the police academy. However, four years have passed. Without new clues, it will be difficult to catch the murderer. Just when we were about to give up, I received a call from the police station...