All Sook-hee has ever known is her training - she's a skilled assassin, ready to put down any hostile target. She had been perfecting her skills ever since she was a little girl in China. But when her mentor and master passed away, life gave an opportunity to start over in a different country, and she moved to South Korea. Her new job - that of an elite government agent. They told her that she'll be on her own after a decade of loyal service. So, without giving it much thought, Sook-hee began a new journey as an actress at the local theater. Soon, two gentlemen appeared on the girl's doorstep, and a new chapter begins. There are some things about the assassin's past that she needs to learn about if she wants to prevail in the upcoming battle.