Holy shit.. I teared up, I really didn't expect that. I thought the two of them were going to meet again after the flashback and have a reunion. Maaan..
Oh damn..
(Edit) This is irrelevant but the girl with the black short hair gets compared to a baby chick(en), and the chicken youtuber dude wears a chicken head, and the girl has the original fighting guide/book from the chicken dude.. Why are there so many chickens
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...