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.

It runs 89 short episodes on Reelife and leans on revenge, marriage drama and secret identity tropes, with each episode ending on a hook.

The draw here is the slow build to a payback that lands hard. On top of that: a marriage that starts on the wrong foot and has to be earned.

At roughly 2–3 hours in total, it's quicker to finish than most full-length series.

Start from episode 1 below; autoplay takes you to the next episode when one ends, and nothing needs a sign-up.