Awakened, She Rises as the Frost Queen 2

Frost Archmage Calista once defeated the Demon Lord. To honor her mother's dying wish, she seals her powers, marries Count Silas, and raises their son Louis. When he brings home a female commander and demands both wives share him equally, Calista reclaims her frost magic. The rival gets possessed by the Hell Lord, and demons flood the city.

VibeShort released it as 60 bite-size episodes mixing marriage drama and fantasy, made to watch on a phone in one sitting or a few.

Watch it for a marriage that starts on the wrong foot and has to be earned. On top of that: a world with its own rules and a lead who learns to bend them.

At roughly 1–2 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.