Part 3/10:
Enter Officer Man-Sik, a seasoned investigator who recognizes the drill used in the disaster as a signature tool of Drill-Bit, indicating the infamous mole's involvement. Despite his previous successes, Man-Sik's credibility is questionable, leading him to covertly enlist his partner Sang-Goo's assistance. Meanwhile, Straw operates his own covert machinations, confronting Dae-Han, the mole who duped him, and demanding access to the real Drill-Bit, ushering in a sequence of meetings that deepen the web of deceit.