Lady, Hamkke Gasilkkayo?

As a devoted knight of her kingdom, Irene M. Voltern has fought for her country countless times. And even when she is offered as a tribute to the Perkan Empire, she readily accepts her fate. She is prepared to become Crown Prince Kael's concubine, but he wouldn't dream of making her do anything against her will. Having fallen head over heels for Lady Irene at first sight, he will do anything to make her happy. But after spending her life putting others first, can Irene finally live for herself?

(Source: Tapas)