Heh, well at least the author didn't cancel out time for the main couple. Still, I really think the jealousy arc about Honju (Seungwon's childhood friend and long time admirer) was absolute stupidity.
WHY would you add him ONLY TO MARRY HIM OFF?? To someone ELSE?
Didn't he have feelings for Seungwon since like, what? 20 YEARS?
Yeah, the second couple has many problems too. Honestly, I don't like Dahm at all. Didn't like him since the start, and I still don't like him. In the end, when they finally met each other, what do you mean he finally blurted out his feelings when he was DRUNK? Not, SOBER? It pisses me off so much. And Sanwoo accepting too. That doesn't feel like they've changed at all, maybe Sanwoo a bit, but it still feels so strange and... weird.
It would've been better if Sanwoo was introduced and the second couple wasn't given much attention, but rather on Sanwoo's courting and Heesu helping him out, it would've been way much better. At least then, it wouldn't had felt rushed or... Y'know. Abrupt?

This story is fantastic and well-written, but I wish the second couple had been introduced later. It would have been better if the author focused on the main couple first and then developed a separate story for the second couple. As of the way it is now, just when the main couple officially starts dating, the second couple is introduced, which disrupts the flow. Readers are eager to see what happens with the main couple! What a shame .