The Armored Bride: I Became a Hostage in an Enemy Kingdom

[Substitute marriage, two male leads, a battle-hardened hostage prince + an emperor who can't fight, pure romance] The first time I saw you, you were wearing armor beneath a red robe. You leaped down from the city gate tower, and I was stunned. How could there be such a handsome man in this world, one so devoted and loyal? In the prison cart, I took pity on you and gave you some water and dry rations. I'll never forget that pitiful little look on your face, not in this lifetime. After that, feeding you became part of my daily routine. Whether it was dried meat or roast goose, if you liked it, I'd bring it to you. Every day, I worried that my third brother would humiliate you, or that some petty scheme in the imperial harem would bring you harm. But then you told me you didn't know whether you liked men? That doesn't matter, though. It's enough if you like me! When the day comes that I ascend the throne, I won't let you suffer like this anymore. But who could have known that the trials we would face together would be even greater than we imagined…