"If I could turn back time, I would never choose you, Kim Jonghyun."   said a girl out of her anger, pain and regret, the girl who has had enough of her lover.    But what if she could turn back time and start all over again? Will she be able to not choose the man she has once chosen? The man she has loved with all her heart?..... Will she not fall in love with him all over again?  

The world has two types of humans; normal and aegis. Aegis is a human who can bear a superpower, having special abilities to protect people. Kang Dongho, or lately called Baekho -being one of the aegis- decided to fight after years of grieving for the loss of his parents and brother with the help of his best friend, Hwang Minhyun. In their journey, they met new friends, brothers, family, and home. But can he accept the truth of his life?

When time meets the destruction of everything.   Your life.   Your friends' lives.   Everyone's.   Would you reset everything?   If you hold the power to do so?   Even if the cost is yourself?