You don't get it. Yirim grew up taking care of kids just to get attention and love. He's independent and doesn't know how to accept help for over 20 years. Cheongho haven't made any decision for himself for over 20 years too, it was said so in the manhwa.
Would you change immediately when you're used to doing something ever since you're born? No.
They're trying to change alongside each other ☠ They weren't in the same page yet they tried to communicate. Even after the baby was born, they still have problems. But so what? They got through it.
Frustrating? Sure, unless you understand their situations. Their trials is what makes their story endearing and unique. In the end, they're lovers who didn't gave up on the other when one did.
But the story was kinda frustrating. What up with them having all the fucking trials the world has to offer. Im already in 45 and the official ending is at chapter 50 and theyre still having the trials that supposed to happen in like 20+ chapter.