The dialogue is done better in the novel, because well its the novel, so you also know yoonshin's thoughts when he chases after sehun.
(Tiny bit of spoiler ahead)
But yoonshin being pushy is the theme throughout the relationship. Once they get together and confess - that's when Sehun starts taking the lead and that too not infront of yoonshin. He protects him from behind the scenes etc. He is the calm composed lead while yoonshin is more desperate. (Sehun even asks yoonshin in one chapter why he is so desperate for affection)
Okay that is probably why then. That explains it. Thank you for the spoiler and hopefully it eventually follows the novel but most of the time these mangas do not. Again I appreciate the reply and spoiler! It clears up a lot of things! (づ￣ ³￣)づ
Am I the only one who thought Yunshin Do was being kinda pushy with Mr. Kang? I mean it's a good story don't get me wrong but like before they got together I feel like he was being kinda pushy when Mr. Kang rejected him more than once already. Other than that though it's a pretty good story.