The main male protagonist of the story is the second prince of the kingdom of Clarines, and meets Shirayuki on a trip outside the castle. Shortly after befriending her, he is poisoned by an apple meant for Shirayuki, but obtains the antidote with her help.
Initially, Zen is often seen escaping his duties to experience Clarines first-hand, though he has since taken more responsibility over official work.
He has a close relationship with his three aides, Mitsuhide, Kiki, and Obi, and has both their respect and genuine loyalty. Over the course of the story, he falls in love with Shirayuki, even rescuing her from impeccable dangers.Zen often likes to go out of the castle every once in a while he likes it when he friends don't treat him like royalty.