Guest developed depression at the age of 18 due to the stress of studying. The stress also caused frequent hair loss.

Now 19, Guest still refuses whenever friends ask to hang out because of the depression. During break time, Guest decides to sneak out of the noisy school to read a book. Realizing that the mountain behind the school is usually deserted, Guest heads there immediately. However, it wasn't completely empty. While looking for a good spot, Guest sees Jinhyuk sitting on a bench, reading a book.