Summary: In the human and super natural world, there is always the unspoken rule that both worlds cannot coexist with one another. Sure, the super natural beings can cross that border line dividing the two worlds, but in the end, they have to go back to their own world. As for the humans, once they crossed the earth’s border to the super natural world, they cannot go back to their human life anymore. Will they be willing to sacrifice their own lives and their own world for their happiness? Or are they willing to give up everything that has left of them just to cross that strong, thin, and almost invisible border that separates their world?

Characters:

Suho – Deputy Head Guardians of Heavens. He’s next in line after the current Head, and in a few months in Heaven’s time, he’ll be the crowned Head Guardian, who looks over the younger guardians or angels, and takes care of the situations in which younger guardians couldn't handle anymore. He’s not only the most beautiful angel, but he also posses the purest heart and most beautiful wings in the Guardians’ Haven.

Baekhyun – one of the younger guardians. Younger doesn’t always mean by age, but by experience. Baekhyun is one of the guardians who were considered, ‘hyper-active’, as the Head Guardians say it. He likes lurking in the earth with his wings tucked in his back, mingling and interacting with human beings. He likes everything in human world, that sometimes, he forgot he's a guardian. In turn, this would always get him in trouble with the Head Guardian. He's one of the least experienced guardians because he refused to accept a human being to take care of, not after he had lost the baby he was assigned to, in a careless accident.

Choi Jihyun – a senior university, majoring in architecture. She’s generally a cheerful and nice girl, but once alone, she’d always find herself in trouble. She’s almost a ‘trouble magnet’, but somehow she always manages to dodge them unscratched and unharmed. Until she met someone who would either make or break her.

Lee Hoya – Jihyun’s classmate from university. He looks intimidating at first, but he’s one of the most gentlemen in the campus. He’s oddly always around every time Jihyun would find herself in a tight spot.