Isn't he a high schooler
He is a senior in high school, becoming an adult next year.
See... That's what I thought. I thought he was like 15-17 (?)
It was confirmed in one of the chapters that he was a senior in high school and he finished his college entrance exams. So he's approaching 18.
No, age of adulthood and graduating of high school usually takes place at 20, not 18, in Korea. He was a couple weeks from 20
How old is Dongho, because people are saying he's 20 and somehow I doubt that.