The Death Of The Queen

the former King of joseon era has two children Lee yeonsu and Lee yeok. the older brother Lee yeok tried to murder his brother to get the throne but was saved by a villager and have a child. a group was made and led by Lee yeonsu to have a rebellion against the royal family and the royal system, his daughter was trained and send to the palace to kill the Prince to make the King killed by the sadness of losing a son. Will she succeed from killing the Prince or will she fall in love and suffer the consequences of betrayal?