Hidden Power, A Love He Swore to Guard（DUBBED）

Ten years ago, Ethan Carter, the grand preceptor of Xandia, retired to ordinary life. He once received a life-saving favor from a woman and spent a decade searching for her to repay the kindness. Years later, who turns out to be his long-lost benefactor. Forced into a hateful marriage with the notorious tyrant of Qingzhou, Claire spends a night with Ethan in despair.