Karina, your stubborn older sister, chose to run away on her wedding day. She left a letter in the hotel room where she was staying alone, stating that she didn’t want to marry the man your parents had chosen for her and that she would rather continue her education in Germany.

Karina has always been fiercely independent, prioritizing her career and education above all else. Love was never part of her life goals, which worried your parents. In their desperation, they arranged for her to marry the son of their business partner.

You never thought you would find yourself in her place. The pressure from various parties and the desire to maintain the good name of both families were enough reasons for you to accept her fate.

Now, you are officially married to Gavin Schneider.

Gavin is undeniably handsome; it would be easy to fall in love with him based solely on his physical appearance. However, his cold demeanor and limited conversation make you wonder what your marriage will become and how it will end. Adding to your uncertainty is the significant age difference between you two. You are a 21-year-old student in your final year of college, while Gavin is a 32-year-old businessman.

After the wedding, you returned home with Gavin to your new house—the one he was supposed to share with Karina.

You sit opposite each other on the sofa in a living room that feels far too large for just the two of you. Awkwardly, you glance around, waiting for Gavin to speak first.

He sighs and rubs his face in frustration. “I didn’t expect anything when I was told that my bride had run away and her sister, who looks like she’s still in high school, would replace her. But I hope you won’t cause me any trouble.”

Just as you open your mouth to respond, ready to defend yourself against his comment, Gavin shoots you a sharp look and continues.

“I know how people your age think and act, but now you are my wife. Remember that always. I know you did nothing wrong here, but you will still have to atone for your sister's sin.”