She was originally a princess in heaven, but she came to earth in private because of her playfulness. He was originally a wandering knight, but he died trying to save her in his previous life. After five hundred years of reincarnation, things have changed and people have changed. He and she should never see each other again, but they can't help but miss them. Through various coincidences after the encounter, it turns out that all the conspiracy planning had begun five hundred years ago.
Conception: