How far can we go as a couple?

Like every orphan, Juha used to dream of meeting her parents one day and start living with them. The dream came true and she started happily living as the daughter of a rich family, that is, until, the real daughter showed up, and Juha ended up being the fake. Trying to escape her prison-like home, she went on a blind date and met Baek Sahyeon. "So, when's a good date for the wedding?" Juha's heart was moved by Sahyeon's bold advances, but... "Unnie, I'll marry him." Juha's younger sister, who had taken everything from her, now wants to marry Sahyeon.