If top stars were given 72 hours to live an average life, what kind of life would they want to experience? Top stars challenging themselves to a new career they once had dreamed of; off-stage. Each member’s daily lives, which have never been revealed during their 15 years since debut, are disclosed in detail. U-Know and Max, each one of them will be challenged to live a life of “a kindergarten teacher” and “a chef”. Follow them closely through “the 72-hour of challenge” that will reveal each member’s differences in character. Follow the lives of Top star’s closely for 72 hours!!