A man and a woman whose lives are shaped by loss and time drift apart in youth and reunite a decade later, discovering that the bond they once shared remains a guiding light through love, grief, and growing up.
Ace NIS agent Jung Hae-seong is demoted after a mission failure. He goes undercover at a high school to locate King Gojong's missing gold, meeting his teacher Oh Soo-ah, who sees him as her lost first love, stirring old heartbreak.
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