Yonggongjagui Anae

Anthia spent years saving lives on the battlefield. With the war finally over, all she wants is peace, but her father’s debts threaten to destroy any chance of that life. Desperate, she answers a strange advertisement for a contract marriage to a duke seeking someone eerily similar to her. But upon arrival, she’s met by Al, a mysterious man tasked with “preparing” her for the duke. As their physical bond intensifies, so do her suspicions about him, the duke... and their dragon-blooded lineage.

(Source: Tapas)