So Eun Ho is the oldest intern in charge of the marketing agency and is known for his cuteness and youthful appearance. Despite living life as a 'YOLO' enthusiast, he unexpectedly entered the job market and began his internship. He clashes with his boss, the workaholic Kang Na Eon, at every turn. Succeeding in every project she takes on, Kang Na Eon is the youngest marketing team leader and a living legend in the industry. She started out as a public recruiter, climbing the corporate ladder to become an executive, all while sacrificing friendships and love for success. However, her life takes an unexpected turn when she becomes entangled in an incident with an intern she initially thought was foolish, completely turning her world upside down overnight. What will unfold as the souls of two people who hated each other because of their very different values swap bodies following an unexpected kiss?