Yang Seungbae (양승배) is a former investigator demoted to a patrolling police officer, introduced as someone skeptical of the double homicide case from three years ago.
Seungbae is depicted as a bespectacled man and is seen rarely smiling. He has dark brown hair and is seen frequently wearing a cap and in uniform. On a later episode, he is revealed to have a muscular body.
As cited by his superior, Officer Park, he appears to pry too much into investigations. Dutiful and prone to skepticism, he has a predisposition for doubt and often second-guesses anything he is presented with. These traits proved to be detrimental as they cost him his position on the investigation team.
Though relegated to the menial tasks of a patrolling officer, he retains these characteristics when confronting a potential house intruder.
In the past, he'd looked into a murder case involving Oh Sangwoo's parents. Though it was declared cold, he investigated further and became suspicious of whether the case's culprit was truly a burglar. He found the evidence of a break-in to be too convenient and measured, as if planned. This left him apprehensive of Sangwoo's character.
Episode One Edit
While out on patrol, he and Officer Park stop by Sangwoo's house when they find an unidentifiable boy standing outside the door. Seungbae approaches him, and is told that he is a relative of Sangwoo. Seungbae bids him farewell, but lingers to watch.
When he hears the house alarm announce that the incorrect pass-code has been submitted five times, he saunters towards the male, but the boy types in the correct pass-code at the last second and tells him goodbye before closing the door behind him.
Officer Park drives himself and him back to the city, where Park finds Sangwoo with a girl. Sangwoo silently watches them converse before Sangwoo introduces himself to Seungbae. He reluctantly introduces himself in return and seems apprehensive as Sangwoo peers down at him momentarily. Sangwoo cracks a joke about if Seungbae smells anything strange, perhaps it's Park's athlete's foot. Park then mentions of Sangwoo's relative being over at his house, to which Sangwoo excuses himself to leave.
Episode Two Edit
Officer Park comments on Seungbae being strange for a while since the encounter. Seungbae inquires of how Park's acquaintance with Sangwoo came to be. Seungbae expresses his suspicion on whether the case with Sangwoo's parents truly was a work of an outsider, noting the evidence of a break-in appeared as if planted, and on the possibility the murderer was Sangwoo. Park cites Seungbae's previous position on the investigation team and his present demotion, requesting him not to place a working father's job in jeopardy.