Ji Hae Soo (Kong Hyo Jin), a prickly psychiatrist, finds her meticulously ordered life upended when she crosses paths with Jang Jae Yul (Zo In Sung), a charming and successful mystery novelist with a secret. While they get off on an adversarial foot, they gradually begin to fall for each other, especially when a series of strange circumstances leads them to start living together far sooner than they ordinarily would have. As their unconventional romance blossoms, Hae Soo uncovers the depths of Jae Yul’s past trauma, revealing a hidden battle with mental illness. Can their love truly conquer the invisible demons that threaten to tear them apart?

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