Dissimilar fraternal twins Korn and Kun have been inseperable since childhood. When Kun starts spending time with someone new, Korn begins to feel like Kun's insiginificant little brother. Now that they're growing up, he has to grapple with the idea of a future without his "older brother" by his side.

Thod sees himself as a black hole—a puzzle without concrete theories, challenging to grasp. Only Nick, his sole confidant and a brother-like tutor, truly understands him. However, time, distance and the passage of years gradually separate them, leaving their long-awaited reunion in doubt.