In the neon depths of Seoul’s Line 2, a ruthless half-French vampire CEO becomes obsessed with a fiery subway tteokbokki vendor — unaware she is a secret Korean shaman who can sense his undead nature. What begins as desire turns into a dangerous power clash between blood and ritual, wealth and will, immortality and fate. As ancient forces awaken beneath the city, love becomes a battlefield — and only one of them may survive the red moon rising over the Han River.