She is the number one female killer in the world.
He.
He is the number one male killer in the world.
Two people who had nothing to do with each other came together because of their precious younger siblings.
When
Baby sister and baby brother fall in love with each other.
What can they do? Only marriage.
But when the news got out, the two protagonists escaped from their marriage.
What to do?
Come on them!
Note: The ending is happy, with stronger women and stronger men. Because younger siblings occasionally become husband and wife, married life revolves around the whereabouts of younger siblings.