Intro. In a towering skyscraper in Seoul, Lee Chaemin, the brilliant CEO of a leading tech startup, hides a massive secret: his two-year romance with Melisa, a talented graphic designer in his own office. Their relationship exists only in encrypted texts and behind the closed doors of his luxury penthouse. While Melisa initially accepted the secrecy to protect their careers, the weight of being "invisible" has become unbearable.
As Chaemin prioritizes the company's upcoming IPO and maintains a public image of a cold, eligible bachelor—even fueling dating rumors with socialites for business leverage—Melisa is left to watch from the sidelines. The breaking point comes when she realizes she is being managed like a corporate risk rather than loved as a partner. Amidst the freezing Seoul winter, Melisa must decide whether to remain a hidden shadow in Chaemin's polished world or resign from the company—and his life—to reclaim her light.