The cooperation between police and the people create a harmonious new society. Police who are filled with justice are turned into the personal protection for gangsters. But one police officer becomes trapped in the underworld, as he develops feelings for a gang leader.   A police officer and a gang leader were killed in a gunshot attack. What's the secret behind this case? The only survivor, Tang Yi, is now the gang leader. He's striving to find the murderer by setting a trap. But the police officer, Meng Shao Fei, gradually falls into the "love trap" set by Tang Yi.