WAIT MOONSUNG??
And woah, to Hp_gd's comment below - that explains a lot. I didn't think much of the 'I wish I was rich' thing until now.
(Edit) Oh, that also might explain Taehoon's interest in Hobin (like when Taehoon joined Hobin's company for Hobin, or why Taehoon helped Hobin learn taekwondo)? Or maybe that has nothing to do with Dowoon.. I don't know LOL