Kill each other first, then fall in love.
On how childhood sweethearts with the weakest feelings develop love while chasing each other.
CP is a cold-faced and cold-hearted senior brother Song Yunqi who only respects the sword × loves to show off and always slaps the kendo genius junior sister Song Jingyu in the face
The main plot is about Song Jingyu protecting the young prince and wandering around the world, which brings up many old events.