Heaven is a place we're good people belongs but one day, Angels noticed that there's an angel who's greedy and has bad attitude and it was Taemin. That's why God decided to send him on earth for him to change. God took his wings and halo for now and if he was able to complete his mission he can get it back, but when he fails God will send him to hell. And when he's on earth a girl(YOU) helped you. Let see the flow of this story when you continue reading.