at Juilliard, because of that they become best friends. Kyle is always compared to Sang-won who always got first place, that's the reason why their friendship once died but now they become close again. Oh Jung-se as Prosecutor (ep. 7 & 9) A prosecutor who was asked by CEO Lee to do an investigation into ratings-boosting of songs with the evidence of Shin Suk-ho's manufacturing Jackson's ratings given to him by Lee. M.A.P6 as 'Jackson' members Members of the boy group Jackson. Jang Yoon-jeong as Radio DJ (cameo ep. 9) An arrogant Radio DJ who ignores Jung Geu-rin's favor. Jo Eun-ji as Site manager (ep. 10) A weird site manager who is a fan of Jo Ha-neul and book Entertainer band for an event for elderly people. Thanks to her Ddanddara Band got more recognition in media social. Kim So-hye as Choi Ga-eun (Ep. 11 & 12) Yun-soo's first love and Chan-hee's biological mom. She suddenly appeared when 'Ddandara Band' gained popularity, at first 'Ddanddara Band' members thought Ga-eun wants to come back to them because Yeon-soo is popular now. But actually she wants to bid good bye to Chan-hee for the last time because she is already married to someone. After the family reunite, they pray for each other and let go their past story to live a new life. Jung Chan as Mr Choi (cameo ep. 17 & 18) The CEO of Wild Company. Suk-ho originally offers him Entertainer Band to be part of Wild Company, but the plan didn't work out. He later makes an offer to buy CEO Lee Joon-suk's shares in KTOP Entertainment. Im Chan-mi (cameo ep. 18) Special MC of The show program along with Lee Seung-hyub. Lee Seung-hyub (cameo ep. 18) Special MC of The show program along with Kim Chan-mi. Park Eun-bin as Soo-hyun (cameo ep. 18) A student who goes to the same university as Geu-rin. She later joins Entertainer Band as their new drummer. Ha-neul is interested in her. Lee Hyun-woo Original soundtrack Part 1 Part 2 Part 3 Part 4 Part 5 Part 6 Part 7 Part 8 Part 9 Ratings In the table below, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings. Awards and nominations International broadcast The series is also set to air in Southeast Asia (Singapore, Malaysia, and Indonesia) through Sony's Pay-TV channel ONE on Thursdays and Fridays at