Yoon Tae In is a cold and hard-working idol star who suffers from somnambulism (a condition which rarely requires a doctor's consultation but it does in his case). He faints while his concert and says the reason is that he got his "sleeping pills and headache pills confused." Rumors start arising about the worldwide successful Luna of which Tae In is a part. People start questioning their friendship and talents. In Yoon Joo is a hard worker who has many part-time jobs and is trying to contact her twin sister, Kang Sun Jun who got adopted. She finally meets Kang Sun Jun but ends up getting disappointed. (Source: XieLalisa at MyDramaList)