Veil And Vow

In the amidst of bullet a figure came out killing almost everyone instantly the best mercenary yet he wasn't able to protect the people close to his heart. 

Living in the shadow of her own identity. Best in everything with no flaw as a human being. Despised by her father because she was not a son he wanted her to be.

A veil of fake identity just to survive and prove her worth.

She said to the only person she can trust on earth 

In this life or the next, Behind any mask I wear. If you reach with those cold hands of yours for me. I'll come even if your world will be burning. 

A vow to give rest to the people he lost. And make sure to bury the people behind there death in earth.

He replied to the only person who make him feel like sitting in a cool breeze.

Even in disguise. Or the mask of false life. I'd find your voice amidst a thousand lies.

Two people from a different world. Were put together due to twisted fate.

A male mercenary acting as female bodyguard

And 

A female princess disguised as male prince due to her personal circumstance.

Will love bloom between them with a red thread of fate.

OR

They are supposed to be torn and tattered in the storm of there life and fate.