In the heart of Seoul, two brothers, Seong Sujoeng and Seong Juhyuk, share a bond overshadowed by unspoken fears and a mysterious past. Despite their resilience, an eerie sense of being watched haunts their every step. As they navigate the city's labyrinthine streets, they uncover secrets that threaten to unravel their existence, plunging them into a world of danger and intrigue.