The Fifth Case (9)

I take a deep breath, locking eyes with Oh. "The police have been investigating you for the recent murders, Oh Sang-chul," I begin, my voice steady despite the tension crackling in the air.

Oh's grip on the hostage tightens slightly, but he doesn't speak. I press on, "But it's not just you. We've been looking into Song Mi-kyung as well."

At this, Oh's eyes widen, a flicker of fear crossing his face. "What are you talking about?" he growls.

"We know you're not working alone," I continue, my heart racing. "There's a partner involved, and all signs point to Song as the mastermind."

"You're lying!" Oh shouts, his composure cracking. "Song has nothing to do with this!"

I raise my hands placatingly. "We know about her brother in the mental hospital, Oh. The expensive care he's receiving. It doesn't add up with your finances."

Oh's face contorts with a mix of rage and panic. "How do you know about her brother? What else do you think you know?"