I Traded My Life for His Glory

GoodShort synopsis

"Ella, a poor girl, loves nobleman Kael with all her heart. To help him reclaim his family's lost territory, she makes a deadly deal with a demon and summons an undead army. But afterward, she deliberately pretends to be greedy and heartless, leaving Kael behind so he will hate her and move on. Six years later, Ella lives under a false identity, raising their son alone while suffering from a deadly abyssal curse. Meanwhile, Kael has been deceived by Isabelle into believing Ella betrayed him. He repeatedly humiliates Ella, unaware of the sacrifice she made for him. Kael's friend Roderick secretly investigates the truth. At the wedding, a memory stone finally exposes Isabelle's lies—she stole Ella's credit and orchestrated the downfall of the Aleramici family six years ago. But by the time Kael learns the truth, it is too late. Ella exhausts her soul and disappears, leaving Kael with nothing but endless regret and their young son."