Contract with the Abyss The Demon CEO's Substitute Bride

Intern Serena is forced by her vicious nominal sister Victoria to sign a substitute-bride contract in exchange for her adoptive mother's surgery fees, marrying Lucian, the rumored brutal and bloodthirsty monster CEO. In truth, Lucian is the pureblood demon lord who rules the underworld. Serena survives, and the rare blood hidden inside her can heal Lucian's abyss curse.