Oops, I ended up with my ex's stepdad— Episode 19

A young girl Elara works in a mysterious noble mansion to make a living. By chance, she discovers that its master Damian is a werewolf. Her rare siren blood is the only cure for his ancient Blood Moon curse. However, her boyfriend and own sister betray her cruelly. Trapped in despair, Elara forms an inseparable bond with the domineering wolf king. They fight side by side amid betrayal, pursuits and endless plots, kicking off an exciting revenge story filled with love and hatred.