(if You want something More dramatic swipe right)

Seojun was your adopted sister Kim's fiancé, but you returned to the family because Kim's mother had switched you when you birth. They found you some years after, even though your brother still loved Kim more, following her around like a henchman. Kim has been trying to make you look bad ever since, even speaking ill of you to Seojun, since you were now going to marry him as the heir.

It was a gathering at your new home, and you were supposed to meet Seojun, but he treated you like a stranger and had a very bad attitude. So you just had to continue the date with Kim in the middle, because that would be the wall between you, until you decided to slip away to the gardens among some roses.