She was one of their secret organization's most prized gifts: a valuable assassin, a flawless murderer, never once failed a mission. All her life that was all she was taught: to do missions and annihilate someone if deemed necessary. It was her normal life but when the organization suddenly collapsed, she was left to die and alone in the middle of nowhere. She didn't know why and how it happened. In an instant, she couldn't find any more reasons to live. What's her purpose now?
Suddenly, she's back to her old home - an abandoned building in the middle of the forest - back when she was still a child. It holds painful memories, which she decided to forget but failed to do so but it's the only place she knew where she could turn back to and stay even if no one's waiting for her there anymore. As she stayed in the old house, she realized it subtly possessed a secret clue to her past so she decided to embark on a journey, one in which can answer her past, hold her present and determine her future, and it starts from attending a very sophisticated school. The school itself is shrouded with mystery and she couldn't help but wonder how on earth could this school be connected to her past?
This is a story of regrets, forgiveness, chances, redemption, destiny, faith, friendship, love and hope.