"Australian Chinese gangster "solver" K (played by Wang Haoxin) wants to stay away from the underworld. His beloved Chloe (played by Zhang Xiwen) dies unexpectedly and is framed and hunted down. K went to Hong Kong to become a middle school physical education teacher O Sir and started a second life. Jovy (played by Tang Shiyong), the new head teacher of Class 5E, is actually the gang leader Qian..."