It was an autumn night; the fateful night. Yongguk's passing, his death, his extermination, whatever you want to call it. Himchan has cried every day since then, six months to be exact. He barely eats. He barely sleeps.

He's lost himself.

In those 6 months, all of his friends have tried to get him out of the house to do something. Anything. Junhong, Jongup, Daehyun, Youngjae. All of them, but to no avail.

So, what happens when Himchan receives a note from Yongguk telling him to find his killer? What will Himchan do when he gets more of these notes?

Will he stay walled up in his apartment forever or will he go out and avenge his lover's death?