Thanks for telling us :). But, I don't think it has anything to do with consent though, since teneegers can and do have sex. I think it's about drawing sex between teenegers/minors. Like, is that allowed or not? Maybe it's not so author didn't draw it for that reason. ^-^
The Hyung is like 18 I think because he dropped out and came back
Yeah I think Hyungseo is 18. JiWook is 19 and Seungeon 17 if I am not mistake.
There's a difference between age of consent and legal age
The age of consent in South Korea is 16.