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What's the story with blonde guy traveling to North as a bride in his sisters place? The northern Lord or whatever doesn't know he's a guy yet and he kept slipping out of his room and going around the town

So i read that one webtoon years ago and never finished it. One of the male leads heart was not beating but he was living normally when he met the other male lead his heart started working? I can’t find it if anyone knows the name i’d appreciate it ^^