Bang Yong Guk wished for love and accompaniment.  Kim Him Chan has to fulfill Bang Yong Guk’s wish as a punishment.

“What are you doing here? Leave.”

“Not till I fulfill your wish”

“What?”

“Didn’t you wish for love and accompaniment? I’m here to fulfill your wish!”

“That’s ridiculous, who do you think you are? How do you know my wish?”

“Of course I will know, I was that shooting star that you made a wish upon”

“Well I’m pretty sure that was just a meteorite and not a human.”

“I’m not human. I’m an angel.”