In the fantastical Pop City, when someone plans to make use of a big song competition for a dangerous scheme, a team of young secret agents has to go on an impossible mission: Within a single month, they'd have to turn into international K-POP stars. There's only one problem: they know how to hack computers, climb buildings, and execute secret missions - but they don't know how to sing or dance. All of a sudden, they'll have to face the most dangerous foe they've ever met: a dancing class. Throughout the training, they'll face strong opponents, feel competitive pressure, and learn the importance of making their voices heard.