The K2 Site

K2 then shadows Kang. He discovers Kang isn’t a traitor for money or ideology. Kang’s daughter needs a rare, expensive medication that Yoo-jin’s welfare fund denied due to bureaucratic red tape. The rival faction offered to pay for the treatment in exchange for grainy phone photos of paper documents.

K2 observes a pattern the analysts miss. He doesn’t look at the data; he looks at the people who handle the data. He notices one of Yoo-jin’s mid-level logistics coordinators, a quiet, anxious man named Mr. Kang, takes his cigarette breaks at the exact same time every day. But more importantly, K2 sees Kang’s reflection in a window—he’s not smoking; he’s holding his phone at a strange angle, as if photographing his own notepad.

This story takes place during the time jump in the original series, shortly after Kim Je-ha (K2) begins working as a bodyguard for Choi Yoo-jin. He has proven his physical worth but not yet his strategic value. The K2

K2 doesn’t kill Kang or turn him over to Yoo-jin’s merciless security chief. He knows that would create a martyr and a trust vacuum. Instead, he brings the evidence to Yoo-jin in private and makes a business argument , not a moral one.

Choi Yoo-jin’s security apparatus is being compromised. Not by bullets or bombs, but by information. A rival faction within JB Group is using a sophisticated data leak—small, untraceable fragments of logistics reports—to anticipate Yoo-jin’s every move. Her private shipments are intercepted, her off-the-record meetings are ambushed, and her digital fortress is showing cracks. Her usual cyber team is baffled. They see the leaks but cannot find the source. K2 then shadows Kang

He says: “If you punish him, the next leaker will just hide better. If you pay for his daughter’s treatment yourself, you gain two things: absolute loyalty from Kang, and a disinformation channel. Let him keep sending ‘leaks’—but now, you control what the rival faction sees.”

The Ghost in the Machine

Yoo-jin, impressed by the strategic cunning, agrees. Kang’s daughter gets her medicine. Kang becomes a double agent, feeding poisoned data to the rival faction. Within weeks, the rival faction’s operations collapse because they were acting on lies.