How

.... Birth...?

Birthmarks are marks you are born with. I have on my hand and leg :)

I'm actually crying lolol

I have a small round birthmark on my knee

AHAHAHAHAH love you

He mentioned something about when he was five. Maybe an accident?

He said when he was five... And it ended

Yeah, both of them mentioned it but it never turned out how

Are you reading a different manhwa?

I have one on my back

Could it be possibly be something like it got darker when he was five? Or everyone considers it as a birthmark but it's a wound from some accident? Burn mark? But if it's a birthmark that means he has had it since birth. Dunno why they say "since you where 5 years old"

Woa same mine is shaped like a house

I have a mark on my hand that resulted from a bad burn and now looks like a birthmark. I just say it’s a birthmark to save time.