Billionaire Marries the Wrong Wife

Quick answer: 9 episodes, English original audio, and episodes 1–9 play right here tonight.

June Miller wakes up next to CEO Alex Highwood after a drunken mistake, intending to slip away unnoticed but accidentally leaving her best friend Sophie's ID behind. Seizing the opportunity, Sophie assumes June's identity and moves in with Alex, becoming his woman. June, hoping to quietly do her job, is unexpectedly promoted to secretary and must carefully guard the secret of that night. Unbeknownst to her, Alex starts developing feelings and suspects she was his one-night stand.

Sophie, playing a double game to climb the social ladder, seduces Alex while plotting against June and her "unborn child" as her supposed friend. Using her wit and luck, June navigates crises until the truth surfaces, revealing her misfortunes were orchestrated by Sophie. Will June survive the multiple crises? Will she and Alex find love in the end?