Leads the investigation into the mass murder. He interviews the caretaker, examines the supposed student apartment, and uncovers physical evidence that dismantles the caretaker's fabricated backstory and exposes the true identity.
Detective Ma pursues the truth behind the murders while Jung-won conceals his true identity.
Detective Ma professionally investigates Sun-hee's death as a homicide.
Detective Ma professionally investigates Dal-bong's death as a homicide.
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