https://mechacomic.jp/books/254560

Lydia, a duchess who died a lonely death as an unloved wife, is given a second chance when she returns to the past immediately after her death. Betrayed by her family and unable to be with the childhood friend she loved, she had also believed that her husband, the serious and seemingly cold Duke Ethan, never loved her. Determined to avoid him this time, Lydia is surprised when Ethan, who had been distant in her previous life, becomes unusually attached to her. A regression romance about a neglected noblewoman rebuilding her life and a clumsy duke filled with regret and devotion. [Original Webtoon](https://www.comico.jp/comic/14233)

At his Class Advancement Ceremony, young Lin Ye awakens the weakest class of all — Summoner — and becomes a laughingstock. But at the depths of despair, he stumbles upon a rare second Class Change… transforming into a Necromancer Sovereign, activating the Undead Calamity System, and gaining calamity-tier undead servants. Thus begins his path of the strong… [Original Webtoon](https://www.kuaikanmanhua.com/web/topic/27899/)

30 years old, my life was over—or so it was supposed to be. A mistress contract with a wealthy heir?! However, the moment I fall in love, it's immediately over.