Finally, The Dawn Came summary:

After eight years, Duke Erte returned to his homeland as a hero. He returned with glory and honor, but all he really wanted was revenge. Revenge for the wife no one remembers. "Rise," who gave her life to protect him to the end. "Will you help me?" And for revenge he needed a woman. A woman to prove his status as an "adult" of age so he could trample on the pride of those conceited nobles. In that sense, this woman was a good fit. "Be my woman." She was a refugee who had lost her home and was working alone to raise her daughter. The only thing about her that resembled his wife was her name, "Rise." But the more time he spent with her, the more the young duke began to realize something. Her resemblance didn't end with just her name. It was then that he thought of a possibility, one he had been denying all this time. She might actually be his wife.