A thin and frail seven-year-old boy with heterochromatic eyes. Son of Prince Sheng and his first consort who died by hanging after being threatened with divorce. He was despised by his father, locked in a courtyard, raised by his mother's old servant, and not provided basic monthly allowances. His name Duo means excess, showing how much his father considers him a nuisance. He was bullied and tied up by other children in a dark artificial cave.
