Akatsuki no Yona OVA

During a rare rest at a hot-spring lodge, Yona's companions notice that Ki-ja is unusually uncomfortable while bathing. Jae-ha's teasing exposes a scar tied to the previous White Dragon, drawing Ki-ja back into memories of the difficult relationship he shared with his father and the burden inherited with the dragon's power.

Later, a drinking contest ends with the group falling asleep one by one, and Zeno's memories open a much older chapter. His past reveals the origins and true cost of being the Yellow Dragon, showing how a man who usually smiles through hardship has carried centuries of loss, loyalty, and loneliness behind that cheerful face.