I was reading first chapters when I posted this comment. But I realized they're actually 19 and 20 years old. I don't know about Korean high schools but I've thought people usually leave school at 18
I think he's 19 bcs chiwoo's 20 and a year older than him. But I'm not sure. And I googled it, Apparently koreans graduate at 19 -_-
I'm guessing that's their Korean age, it's different. But yes, they don't look like highschoolers
Yeah these High Schoolers be on steroids. Anyway. Korean ages are different depending on which half of the year you are born in. But you're typically looking at Korean ahes being at least one year older. So take your age and add 1. They're still graduating at 18/19 but for them its 19/20.
Have a look at this if you're interested https://www.koreanclass101.com/korean-age/
These dudes are too huge. They don't look like high school students