In Once in a Thousand Years General, Lu Yan has slumbered for three thousand years, his sole purpose: to awaken and bring back the powerful and mysterious "Righteous Lady." But when Yu Deng Deng — the spirited leader of Qingquan Village — accidentally rouses him, destiny takes an unexpected turn.

Struck by his striking looks, Deng Deng boldly declares she wants to marry him — unaware that Lu Yan is no ordinary man, but a legendary general from the past. What follows is a whirlwind adventure filled with hidden identities, ancient secrets, and unexpected romance, as the two unravel the truth about each other — and their intertwined fates.