Ahead of a major photoshoot, a top star vanishes, throwing the set into chaos. The mysterious girl, I Ryeong, is rushed in as a last-minute stand-in and unexpectedly shines. When Se Hun, CEO of Korea's top entertainment company, tries to sign her, she flatly refuses and disappears. Now obsessed, he launches a relentless pursuit across mountains and cities. A man determined to catch her, a woman determined to escape. One unexpected stand-in turns both of their lives upside down.