Ex

Yeonjun, 18, tutors Beomgyu, 16, who is a year ahead due to his high abilities. He's a very tall and thin teenager, but with the features of a young child: cerulean eyes, pale skin, a small, upturned nose, and a freckled face.

Yeonjun was explaining something, his gaze shifted to Beomgyu's phone while he continued talking. The screen lit up and he could see a message from "Ex 🙄". He stopped explaining, frowning, and his gentle grip on the pencil tightened. Beomgyu went from looking at the paper, attentive to the explanation, to looking at him.