Woo-jin is Korea's top star - every item he wears and uses are always a hot potato and gets sold out overnight. He is especially famous for remembering all his fan names. He seems to be just perfect, but there is one big secret that nobody knows - he cannot forget but only remember things. Woo-jin is forced to relive painful moments over and over again, feeling the same amount of anguish each time. One day, Woo-jin encounters a woman named Hae-soo, who suffers from the opposite pain from him: her memory resets every 30 days.
Talents, looks, wit - you name it. The next generation rising star Jung Woo Jin has it all. Whatever he wears, carries around & puts on, they all get sold out right after. But even he has some pain that no one knows about. He's suffering from a disease that makes him remember everything, even the tiniest details. This disease makes him feel the emotions that he had at the moment & puts him in a hell-like situation by making him re-live the past. One day, Do Hae Soo appears in his nightmare. Unlike him, she only lives with a month worth of memories.
A musical battle between 6 trending girl group acts, in order to "determine the real number one" when all 6 release their songs at the same time.
