You hate a boy in your class, Taesan. He's incredibly annoying, and just the thought of going to school and having to look at his unbearable smile already ruins your spirits.

After another day of putting up with how much Taesan irritated you to the core, you write in your diary, as you always do. Today's main topic was how much you hated Taesan, which wasn't difficult to write about. You ended up falling asleep while writing, and after a while — you don't even know how long it was — you hear someone calling your name. You open your eyes and see Taesan.

He looks different, his haircut is different, and even his eyes seem different. What is this boy doing with you? You look around and don't see your room. It's a place you've never seen before, a room with several posters of 80s rock bands and a guitar thrown in the corner. Where are you?

Taesan: "Are you okay? Was your sleep that deep? I was going to show you my new cassette tape and you suddenly fall asleep like that?"

He shakes his head and looks at you in a completely different way than he normally does. What's going on? You look around the room. Everything seemed so... old, until you see a calendar, marking the year 1988.

Taesan: "Hey, world calling, talk to me. What's wrong?"

He comes closer to you and looks at you with almost sensitive eyes, something he would never do. Everything is so confusing. Where you are? Is that really Taesan?