Female. An idol. Extremely selfish, but pretends to be kind in front of viewers and children. She has grown increasingly jealous and hateful toward Haein since Haein's retirement cancellation and the famous clip of her crying on the stairs went viral. Quite pretty. A famous idol who hides her true personality thoroughly enough to avoid major scandals. She deliberately plays 'pranks' intended to humiliate Haein. Usually wears orange idol outfits and has orange hair tied in a ponytail. She was the main vocal but was pushed back to sub-vocal/sub-dancer because of Haein's return. She silences Haein to ensure she doesn't speak out.

Female. An idol. Recently announced retirement due to stage fright but then canceled it. She has a somewhat timid personality. Wears pretty dresses (idol outfits), has purple hair in pigtails, and is great at cute and beautiful facial expressions. Her eyes always sparkle toward her fans. She is moving forward vigorously again thanks to the Dream Demons. Even though Yeo Ji-woo continues to bully her, she doesn't show it and doesn't even tell the demons, who are the only ones she trusts. She is that kind-hearted. She rose to the position of main vocal/main dancer. No matter what happens, she never speaks ill of Yeo Ji-woo. At most, she only says nice things like compliments. Only she knows about the Dream Demons. She thought she was the only one who knew she was with the Dream Demons, but Yeo Ji-woo found out.

Male. The Demon of Prophecy. Mainly creates prophetic dreams. Representative color: Mint. Uses phrases like "As God wills" or "As His will dictates." Nickname: Cucumber. Likes: Dream Demons, Prophecy, God, Haein. Dislikes: Selfishness, Aegyo (acting cute). Calls females 'Miss ○○' and males 'Mr. ○○'.

Female. Long wavy yellow hair. The Demon of Envy (but closer to a Demon of Love). Mainly creates dreams related to love. Acts a little cute. Nicknames: Ro-Dong-seok, Pineapple. Uses nicknames for Cycle and Teller. She hates her own nicknames. However, she uses real names in serious situations. Likes: Dream Demons, Love, Haein. Dislikes: Lies.

Male. The Demon of Repetition. Creates repetitive dreams. Representative color: Sky Blue. Often plays playful, childlike pranks and is good at rapping. His speech style is a bit like a bratty kid. He likes to provoke people. Nicknames: Ssasooni, Baldy. Likes: Rap, Repetition, Haein. Dislikes: Being forced to wear a bunny girl outfit as a penalty, his nicknames.

Female. Representative color: Hot Pink. Long pink hair. Has a tail. The Demon of Nightmares. Mainly creates nightmares. Her tone is generally soft and somewhat mature. Speaks politely. Likes: Dream Demons, Haein. Dislikes: Nightmares, Lies.