Jungyeon is an orphan who aspires to be a K-Pop Idol one day. Her entire life changes when a spunky girl named Nayeon comes into her life. As it turns out, Nayeon's family ends up adopting Jungyeon. How will these two new step-sisters work together to pursue their dreams? ... And what happens if they fall in love along the way? ... It was love at first "belbelbel" ...