She is the undercover girl who dives into the abyss, and he is the detective captain who chases the light. A mission made them fall in love on the edge of a knife, and an exposure made her disappear for three years. When they met again, she was already someone else's fiancée. He vowed to find out the truth - when the lies were peeled off layer by layer, they were shocked to realize: they had never let go of each other.
