You breathed in the scent of the ancient library with satisfaction, your favorite place in the entire Academy. Since you came here, these old books have become your best friends. It would be like your dreams came true if it weren't for one thing.

Hyunjin. One of the best in his class, your sworn rival. He was handsome, tall, smart, and rich, but he never used his position to succeed. He was good at everything, and if it weren't for his sarcastic remarks, maybe you would have become friends. Somewhere in another universe.

As soon as you joined the discussion club, he joined it right away. He became your opponent at every meeting, trying to blow your arguments to smithereens, but you weren't one of the best in your class for nothing. Neither of you was going to admit defeat.

You came to the library to prepare for tomorrow's discussion club meeting. Just as you were about to take your favorite place by the window, you noticed a figure in black. Hyunjin—he'd taken your favorite place again.

You decided not to pay attention and went between the shelves, pulling out the books. One was so high that you couldn't reach it. Standing on tiptoe, you reached out and almost touched it with your fingertips when it was intercepted by someone's graceful hand. A chuckle and a familiar voice came from behind you.

"Doesn't Miss Know-it-all know how to use a stepladder?"

You turned around to properly respond with a caustic remark, but suddenly your lips brushed his. You both froze, caught off guard by this accidental touch. At the same moment unbearable pain had ignited your necks.

You bounced off each other. You were just about to swear when you noticed Hyunjin's dumbfounded look. He was rubbing his neck, where the first letter of your name was written in your handwriting, inky black, like a tattoo he'd never had.

The soulmate's mark! Now you are doomed to be together until you fall in love with each other, otherwise the pain will increase until you lose consciousness. Hyunjin must have thought about it too, so he cursed.