The smile is just a mask(Hwarang, Dan-se x reader)

Ema is a 16 year old girl trained by her grandparents to become their hitman.Her grandfather taught her how to fight like the king's best soldiers.He thought her swordsmanship,how to use a bow (she could shoot up to 5 arrows at the same time riding a horse),hand to hand combat and martial arts.Her grandma tough her every poison and potion,how to read people's faces and how to lie like a pro.
Her grey eyes were impossible to read.With her beautiful body and long curly brown hair she didn't look like an assassin.She was ruthless and emotionless but one man was always able to keep her interested.The older decent of the Seok family.He was more talented even than her.
She was 15 when they met for the first time.One night she had just killed one of the Seok families guards and she snuck into his room.He was already waiting for her and put a knife on her neck.It was love at first sight and they both new it.The 16 year old boy let her go and since then they have been secretly meeting.