Kim Jaejoong and Jung Yunho, they met once in the earth when jaejoong's halo fell into the earth when they still children and yunho help him to search for it. Ten years later, jaejoong return to the earth to return yunho's favor. But yunho refuse him and saying that he didn't remember him.

Still, jaejoong persistenly following him home and then he found yunho's secret and the secret force him to do something forbidden for an angel to do. He still did that, knowing and ready to receive the punishment and consequences because his heart touched by yunho's kindness since long time ago.

But what would yunho do when he know what jaejoong do? He wish he can turn back the time and prevent him from doing so but time were never turned back, only move forward and he was left with regret and sadness.