"Monster Detective" Ma Xidao (Ma Dongshik) will be fighting against the leader of the largest illegal online gambling organization, Baek Chang-gi (Kim Mu-yeol), a former special forces mercenary. He will also have to deal with Jang Dong-chul (Lee Dong-hui), a genius CEO from the IT industry. Ma Xidao will work with the gorgeous return of Jang Yi-su (Park Ji-hwan), the Guangsuo Team and the Cyber Investigation Team to launch a more powerful sweep than ever before!