If you have survived—or are currently enduring—high school, you can empathize with Joon-Woo. As an outcast and a loner, his sole pleasure derives from the time he spends on his phone, engaging in random chats with strangers. The experience feels bizarre and pointless, until Joon-Woo hits the jackpot: he is paired in a private chat with an attractive young girl his own age. However, when he realizes that this same pretty girl is actually his classmate Seung Ah, the situation becomes uncomfortably real for a guy who has never even been kissed.