The protagonist, a ten-year-old Omega boy born in the slum during harsh winter. He is thin, pale-faced, with beautiful clear eyes. After his Alpha brother froze to death and his mother and younger brother fell ill, he was taken by Feng Yunxue to become a child bride. He was renamed Bai Yu. He is obedient, kind, good at taking care of children, cooking, and sewing. He suffers from frostbitten hands that eventually lose feeling. He deeply loves his mother and brother and willingly sacrifices himself to save them.
