In a world where low and upper class are strictly divided, people in the outskirts of Seoul are easily stricken by diseases, yet have difficulties obtaining the expensive cure for wellness. One of them is 19-year old Lee Mi Jun; who dropped her education to serve her financially corrupted family and her deathly sick mother. In order to aid her siblings and beware her mother from death, she leaves her illegal job at the black market and takes matters into her own hand - she applies as assistant manager at Big Hit Entertainment under a fake identity. She meets the abstruse and mysterious Jeon Jungkook, CEO of Big Hit Entertainment. His personality seems to be impenetrable; his affection towards Mi Jun rather bold. He promises her the amount of money it takes to save Mi Jun's mother... yet what she actually has to go through to pay that prize turned out to be the least she had expected.