his guitar. He felt respected as an 'entertainer'. After he heard the news that Shin Suk-ho had built his own company, he comes to him and asks him for a job. At first Suk-ho refuses because he is a single dad of a son (named Chan-hee), but then Suok-ho decides to accept him into the band. He is the bassist. He likes Yeo min-joo. Byung Hun as Seo Jae-hoon Jae-hoon is a student at Seoul University and belongs to a rich family. He loves playing drums in his free time. He seems like a Mama's boy and since childhood, he has followed whatever his mother wanted. After thinking for a while, he decides to leave his mother's dream and to follow his own dream focusing as a drummer of 'tantara band/Ddandara Band'. Extended Jo Bok-rae as Jo Sung-hyun, Jo Ha-neul's older brother Kim Ho-chang Kim Min-chan Jung Kyu-soo as Shin Suk-ho's father Sung Byung-sook as Shin Suk-ho's mother Choi Ji-na as Jae-hoon's mother Kim Sung-kyum as Min-joo's father Special appearances Kwon Nara as Song-Hee (cameo ep.1) She is a member of girl group named 'Lucy girl' and she is dating Ji-nu, member of boy-band 'Jackson'. Both of their group belong to the same company 'KTOP Entertainment'. Dojoon (cameo ep.2) Hajoon (cameo ep.2) Jaehyeong (cameo ep.2) Park Shin-hye as Assistant Manager Park (cameo ep.3) She is seen bringing coffees to Mango's building with Yeo Min-Joo Kim Kiri (cameo ep. 4) He is a personal trainer in KTOP originally hired by Shin Suk-ho, he is the one who give information to Suk-ho about Lee Ji-young in KTOP. Min Do-hee as Luna (cameo ep.4) She is a KTOP Entertainment trainee for eight years, but she suddenly leaves the group near her debut because she doesn't accept that her part is shared with Lee Ji-young. After her departure her stage name 'Luna' is given to Lee Ji-young. Lee Sun-bin (cameo ep.4) Ken (cameo ep.7) Special MC of The show program along with Zhoumi and Yerin. Yerin (cameo ep.7) Special MC of The show program along with Zhoumi and Ken. Zhou Mi (cameo ep.7) Special MC of The show program along with Ken and Yerin. Seo Kang-joon as Lee Sang-won (cameo ep.7 & 8) A famous classical guitarist who visited Korea for a concert and a former acquaintance of Kyle in Juilliard. He and Kyle are the only South Korean students majoring in classical guitar