Ren, an imperfect angel, part of the Fallen, angels cast out of Heaven for doing something unacceptable. He fell in love with a mortal on earth, resulting in his wings being taken from him and a sentence to live an immortal life on earth. But there is a catch. By day Ren is a normal man, just the scars from wings being taken upon his back. By night, everything switches around. He becomes a completely different person. His personality becoming like the sky, covered in darkness with no emotions. It is a side effect of becoming one of the Fallen. Only Minhyun can help him find the part of himself that he has lost, the ability to love.

Trailer: http://m.youtube.com/watch?v=O_Gmi3CZyFQ&desktop_uri=%2Fwatch%3Fv%3DO_Gmi3CZyFQ