I'm a Security Guard, But My Heavenly Master Identity Can't Be Hidden

Zhang Bufan travels back twenty years with a Heavenly Master Simulator system. While working as a security guard at Ning'an Yuan, he accidentally activates a Pure Yang body. From the Water Ghost in the underground garage to the elevator spirit in Building 8, he encounters foreign ghosts and a black snake spirit in the wealthy Li Zhengxian's home. He catches ghosts to earn merit and helps Xiao Xue and her mother clear their wronged reputation and find peace. However, antique dealer Chen Xiansheng sets a trap using funeral money to test him, only to be exposed by Zhang Bufan outside the hospital ward. Behind the seemingly calm ghost-catching journey, what deeper purpose does Chen Xiansheng's master plan hide?