I see the last three pages, I look closely to that photos of parents hold their babies. I repeat, THEIR BABIES. I think Namsoo really has twin brother (or sister), and it really is Hyeongoh. Oh my God.
Not only that, when they switched places... Only people who look REALLY similar can do that well enough to make themselves into the original. Namsoo looked identical to Hyeongoh after dying his hair. (I can't remember if he did anything other than that, but that was such a shocking transformation.)
I see the last three pages, I look closely to that photos of parents hold their babies. I repeat, THEIR BABIES. I think Namsoo really has twin brother (or sister), and it really is Hyeongoh. Oh my God.