Imagine you had the perfect life. A nice house, lots of friends, a loving family, and you never had to worry about the future. You'd never want to leave. Now imagine you had everything you've ever known, ripped from your arms and destroyed.
How would you deal with the loss? Well, Yin and her brother did the only thing they could, and try to live. They became assassins. At age 10, they had some minor training from their father, and that's about it. The Guild took in the twins and raised them as their own, and showed them what it's like to have a purpose. A reason to live.
They showed them how to fight. How to take a hit. How to shut themselves out from the world. The once perfect life they lived is dead, and it's their job to try to make sure that they don't lose themselves, or the people they are bound to protect. They must learn to sacrifice everything for those around them, but is it worth it? Yin must be willing to let people in again, to trust herself, and her brother. Yang has to do possibly the hardest thing in his life, he has to let go of the past, and see people for who they really are, not who they appear to be. The twins have been through a lot, they've faced many things, and conquered them all, but will they be strong enough to face the world's demons, and their own?