"Can't we all just live together?" It would be nice, but for the twin brothers Il-do and Yi-do, it's just a wishful thought. Born under a cursed fate due to their parents' original sin, one must die for the other to live. To avoid this, they have deliberately cut off contact. However, when Yi-do, who works for a gang, gets stabbed, Il-do somehow hears about it and rushes to donate blood, saving his brother's life. But instead of gratitude, Yi-do attacks him the moment he sees him. In a world where even brothers have turned against each other, Il-do and Yi-do live in a survival-of-the-fittest reality, where failing to kill the other means facing one's own potential death. The film underscores this harsh reality by occasionally showing the brothers' lives from the perspective of a bird of prey circling in the sky, looking for its next meal. If heaven and earth were to flip, changing the world's top and bottom, would the brothers' fate change too? Paradise answers this question by suggesting that, just as Il-do and Yi-do are identical twins, heaven and hell are two sides of the same coin. So, among the two who cannot live together, who will survive? (HUH Namwoong)