After finding that Sergei, the supernote forger, contacted a Russian mafia before being killed, Ji Sung raids the mafia but fails to find a lead. As the case becomes harder to be resolved, Ji Sung finds out about airport banks receiving new notes from Hong Kong every day and demands to view the process. This brings Ha Jun to strongly resist Ji Sung for doubting the security team, but Do Kyung cooperates. Meanwhile, Do Kyung sees Myung Woo for a migraine and Myung Woo gives Do Kyung her blessing.