Chang-ho (Lee Jong-suk) has an interrogation with a witness who knows important information about Big Mouse, and Ji-hoon (Yang Kyung-won) and Do-ha (Kim Joo-hyun) watch it nervously. Meanwhile, Ji-hoon approaches Mi-ho to find Seo Jae-yong (Park Hoon)'s thesis through Mi-ho (Im Yoon-ah), but does Mi-ho know the identity of Park Chang-ho? Or is he being deceived?