Jung Taekwoon. He has always heard stories about the human world from his 'lifelong friend' that lived on the other side of the door that separated the two. He learned to laugh, cry, envy, and sympathize because of a boy called Cha Hakyeon. The two were so different yet so alike. Little did the two know that their secret little meetings was the beginning that could cause the worlds of the Gods to turn upside down.