The Flasher (3)

My fingers tremble slightly as I dial Han's number. It's early, barely past dawn, but this can't wait. The phone rings twice before Han's groggy voice answers.

"This better be good," he grumbles.

"Han, it's me. I've found something. About Jin Dohoon. It's... it's worse than we thought."

I can hear the rustle of bedsheets as Han sits up, suddenly alert. "What do you mean?"

I take a deep breath and launch into a concise explanation of my night's work - the cracked code, the pattern of escalating incidents, and finally, the horrifying discovery of Kim Mi-sook's murder.

There's a long pause on the other end of the line. When Han speaks again, his voice is tight with tension. "I'll be there in twenty minutes. Don't talk to anyone else about this."