Choi Eun Seol (Shin Sae Kyung), sole survivor of her family’s brutal murder, loses her memory but gains an extraordinary ability: she can see smells. Renamed Oh Cho Rim by her new adoptive father, she teams up with Detective Choi Mu Gak (Park Yoochun), who lost his sister in the same incident and has since lost his sense of smell. He's determined to catch the killer, but his lack of senses hinders him. Cho Rim's unique gift becomes their greatest asset as they navigate a world of invisible clues, chasing a phantom killer. But as they draw closer, their intertwined pasts unravel, revealing secrets more dangerous than they imagined. Can they unmask the murderer before he finishes what he started?

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