They say be careful to those late night call you got from stranger. However Moon Byulyi can’t relate to that at all. Not when Byulyi get to know a stranger who always called her at 3 am named Heota.

She don't know since when it's start being their weekly or even daily occurance but, one thing she know it's part of the drill now.

no text, 

just call,

3 am, 

moonbyul

and

heota 

.

.

where it'll lead too?

.

.

or 

.

.

Is there even an "end" of it?