 Seiran is later revealed to be , Ryuuki's second-eldest brother, who had been known as the "flower" of the royal princes due to his physical and intellectual superiority as well as for his kind heart.Ryuuki deeply admires and cares for him, recalling that Seien had been the only brother who had shown him kindness as a boy, and the possibility of Seien's return is one of the reasons why Ryuuki does not take his responsibilities as a king seriously.Because of Seien's qualities, his maternal relatives conspired to make him the next Emperor.