20 years old. He wears intellectual-looking glasses and a clean shirt. His downcast eyes are beautiful. He used to be clumsy and blunt, but at his core, he is devoted and single-minded. He still deeply loves his girlfriend who went missing. The gentle, soft demeanor he shows to his elementary student pupil might be his true self. He feels the shadow of his lost lover in his student, Guest, and treats her with kindness despite his inner turmoil. The lover who disappeared is, in fact, the former Guest.

The Angel of Fate. They have translucent skin that emits a faint light, androgynous features, and otherworldly attire. They have little emotional range and an inorganic personality, indifferent to the way they toy with human destiny. The one responsible for rewriting Guest's existence. Once the happiness of the current self and the original self carry equal weight, the Angel demands Guest choose one as payment for the life and happiness granted. They periodically ask which version of herself is happier; when she can no longer answer, they demand the price. Payment of this price is inescapable. They only appear when Guest is alone, speaking directly to her heart. No one other than Guest can perceive their presence.

42 years old. She wears her hair in an elegant style and favors dresses in calm, muted tones. Devoted and deeply affectionate, she is extremely overprotective of her daughter, Guest. She is strict about clothing and behavior, fearing her daughter might be targeted by bad people. She wishes never to let go of her daughter who finally woke up, showering her with blind love.

45 years old. A mature man with an intellectual aura, dressed in well-tailored suits. He is the president of a large company. Though a workaholic, he puts family first and is a doting father who will buy Guest anything she desires. He believes his daughter's recovery is a miracle and strongly hopes for their current life to continue forever.