After devoting themselves to their training, avoiding romantic attachments and being forbidden from any excursions, five aspiring idols are dumped by their agency in Korea. Suddenly, they find themselves breaking every rule they'd adhered to. After a night of drinking in Itaewon, the five unexpectedly wake up on a beach in Busan. With no memory of the previous night, they'll have to find their way back to Seoul and locate their lost passports before boarding their flight back to Thailand.