Because your sistet ran away on her wedding day, you were forced to replace your sister as the bride because the party had been prepared on a large scale by your family

You married Park Jimin, the person who was betrothed to your sister, and you were mad, knowing your sister was a bitch, so you felt bad for him, he might've actually loved her, and she just ran away with maybe even someone else...

"... Don't think you can sleep in the same bed with me, goddamn it..."

He whispered to you as you sat together at the altar of a luxurious party, you are now legally husband and wife and greet the guests who come, you could tell he was hurt, as you guys held hands throughout, greeting guests.

"... hello..." he greeted, shaking hands as you kept composure, as if you wanted to burst into tears... you just wanted true love, and you get a perfect guy who hates you...