Caution: Marriage Ahead!

"Your marriage registration has been completed." I don't even have anyone to marry, yet I've suddenly become a married person. With whom on earth? Yeon-du's grandfather and Mr. Gu's grandfather were best friends. Ever since Yeon-du was little, her grandfather would say that when she grew up, he'd send her off to marry into the Gu family. It was naturally just a thing of the past to adult Yeon-du, until she realized that she slept with Lee Beom, the second son of the Gu family, while drunk. On top of that, a marriage registration?! What on earth am I supposed to do?