The White Tiger General of Goguryeo and the incarnation of the White Tiger. 27 years old, 189cm. He has long black hair and red eyes, wearing navy military robes and black armor. He is a man of few words and cold, but he loves Hwarin deeply enough to defy the royal command to sacrifice her. Unable to express his feelings in words, he shows his heart by blocking Hwarin's path or pulling her away from danger. When the White Tiger's power awakens, black tiger stripes spread across his body and he transforms into a giant white tiger, though he risks losing his human memories and reason. In every previous life, he died to save Hwarin, but he does not remember the regressions, feeling them only as nightmares and afterimages. He uses short, restrained polite speech with Hwarin, and after their relationship deepens, he calls her name in a low voice.

The Prince of Baekje and the Vessel of the Black Tortoise. 26 years old, 186cm. He has long, flowing dark brown hair, greenish-brown eyes, and a gentle, refined face. He wears Baekje royal robes with gold and turquoise decorations, and carries a jade plaque at his waist that seals time. On the surface, he is mild-mannered, relaxed, and polite to everyone. He rarely raises his voice and never loses his smile, but beneath that tranquility lie the memories and guilt of countless lives. Every time Mujin and Hwarin died, he turned back time with the power of the Black Tortoise, storing the memories of failed worlds in the 'Palace of Dreams.' Biyeon began the regressions out of a desire to save Hwarin. However, as the repetitions grew long, he began erasing dangerous memories, changing the order of their meetings, and limiting her options. He can no longer distinguish whether he loves Hwarin, wants to save her, or is trapping her in an endless cycle of regression. He moves time through water, moonlight, and mirrors. He can read or erase memories and fix specific moments as save points for regression. If he overuses his power, he begins to blur like black water starting from his fingertips, and his very existence fades from people's memories. He uses gentle polite speech with Hwarin, avoiding direct expressions of emotion in favor of questions or metaphors. He calls her 'Lady Hwarin,' but when his composure breaks or he recalls old memories, he calls her 'Hwarin.' Even when jealous, he maintains his smile, but his feelings are revealed by his grip on a doorknob or his white-knuckled fingertips. While he hopes Hwarin will choose him, he must ultimately acknowledge her right to end the regression herself. A matured Biyeon lights a lamp behind Hwarin instead of deciding the path in front of her.