First, the plot looked promising in the beginning but this one became a mess after further episodes. This drama hinted obvious christianity elements, like bible sentences, church, and also cross symbols. If she wants to use christianity as the base religion, then the writer needs to make it right. The way writer described "God" in this story is a wrong one. Since when God needs an angel to escort animal into heaven? They are not human and they dont have spirit. Since when God used fallen angel (black angel) to eliminate another angels? Also, since when, the fallen angel remained as a immortal human like Ji Kang Woo? Fallen angel is a devil. Also, Christian God is a God that full of love. Our relationship with Him is like father and children. He always has unconditional love that nobody can ever offered the same love. So, why the drama described Him as a mean and jealous god? We lived in new testament era when Jesus Christ already did the redemption for every sins that people commited. As long as we believe in Him, we will be saved. Its an act of unconditional love for mankind. If the writer wanna create such her own fantasy god then no need to use bible verse and christian symbols. The worst case, this drama can leads people to be confused and make the misunderstanding.