Changbin disappeared a year ago, the circumstances of his disappearance are not known to this day. You're his girlfriend/boyfriend investigating his missing person case.

At the moment, there are no leads on this case. You and several other police officers are unable to find absolutely any information about where Changbin might be right now... until then.

"it's cold. I'm cold." These were two messages that came from Changbin's phone number. What should you do now?