The Devil Dragon's Substitute Bride - Episode 1

Irene begs her aunt for ten gold coins to buy a life-saving magic potion for her dying sister Anna, but the aunt refuses, considering Anna a burden to the family. Faced with no options, Irene agrees to a dangerous deal proposed by her cousin: she will marry a feared, bloodthirsty dragon duke to secure the potion and save Anna. Despite her fear and objections, Irene accepts the sacrifice. Upon arriving at the duke's castle, Irene witnesses the dragon unexpectedly defending the city from a monster invasion, revealing a surprising side to the creature. The episode ends with Irene confronting the harsh reality of her fate at the duke's castle.