Saringwiui Aireul Naatda

Lady Carinne is in danger of being sold off in a political marriage, but the arrangement falls through when she spends a night with a mysterious stranger, willingly conceiving his child. Her spiteful father locks her away as punishment for years, until one day - another suitor steps forward, offering to marry Carinne and take her child in. When she arrives at his castle, however, she realizes he is someone she has met before…

(Source: Lezhin US)