Sweet 18 (2004)

As children, Kwon Hyuk Joon and Yoon Jeong Sook were promised to each other by their quite traditional families. Yet, shortly after that, the families lose touch and it isn't until many years later that the two of them meet again by chance, Hyuk Joon as a successful prosecutor and Jeong Sook as a graduating high school student. Though their characters don't mesh that well and there's more differences than coincidences between them, they decide to go ahead with the arranged marriage, a bit to follow the family indictment and a bit out of loneliness, hoping they'll be able to make it work and that love with follow.