She comes from a distant technological era;
He was a world-famous assassin in ancient times.
Time and space intersect, and she travels from the future to ancient times due to a mission. What kind of marriage will he and she perform on the stage of the Warring States Period?
Is it fate?
Is it destiny in the previous life or is it destined in this life?
When she returns to the future after her mission is over and faces separation, what kind of future will he and she have?