My Sister's Fiancé is My Earthquake Savior

Ryan's love for my sister was intense.
How intense, you ask?
I merely had an argument with her, and he used his influence to get me fired from my job and even had some thugs corner me in an alley to humiliate me.
Later, I finally met him.
You know what's funny? He turned out to be the very man I had saved during that earthquake three years ago.
Separated by a wall, unable to see each other, we endured eight days and six hours of hellish torment together, listening to each other's voices.
Back then, he earnestly promised that if we were rescued, he'd surely make me his girlfriend.
Suddenly, I found myself eager to see his reaction when he learned the truth.