Jessica Jung is a famous singer, she works at SM Entertainment and has a boyfriend called Kwon Yul who also works there but then as manager of the pop group SHINee. AJ Liu is one of the producers at SM Town. He is also Yul's bestfriend. He is cold serious person since his parents and sister died in an airplane crash. Krystal Jung is Jessica's little sister, she has been living in America for 6 years and moved back to South-Korea since she missed her sister really bad. Jessica takes her to her job and introduces her to everyone. Minho falls inlove with her so as Taemin and Kai, but one big problem............ Krystal is head over heels for the producer AJ Liu.