What part of prim and proper do you not understand?

Dongwoo made a new resolution.

Now that his secret was out to the twins, there was no use hiding. But... He still couldn't get involved with them.

They might not believe in curses or whatnot, but he was still scared of ruining their life just because he decided to be greedy and selfish and have them to himself.

For crying out loud... They had a bright future.

Both brothers agreed to be with him but he just couldn't see that happening. They had appearances and origins that were far apart from his, so why would they like him of all people?

He was simply too plain. (Cough. That's what he thinks)

They said he made a huge positive impact in their lives, so was it since then? No, they couldn't have possibly held feelings for him since they were so little.

Did they even know the meaning of life and love when they were that young?