Main •
Namkoong Min as Baek Seung-soo :The new general manager of the Dreams who was hired despite having zero experience managing a baseball team. He has a "golden resume", leading wrestling, ice hockey and handball teams to championships, but they all end up folding afterwards due to circumstances outside his control. He doesn't have a particularly nice personality but he is determined to make the team the best in the league. •
Park Eun-bin as Lee Se-young :The Dreams' operations manager. She is the only female manager in the league and is very passionate about her team despite their poor fortunes. Though she has been working in this field for ten years, she never gives up. •
Oh Jung-se as Kwon Kyeong-min :The president of the team and a junior managing director with Jaesong Group, which owns the Dreams, and the nephew of its chairman. He plans to shut down the Dreams as it is unprofitable, and hires Baek Seung-soo to help him do so, but soon comes into conflict with him when Seung-soo puts real effort into making the team successful. •
Jo Byeong-kyu as Han Jae-hee :Se-young's co-worker at the operations team. He got the job through his connections, but as time goes by he shows his passion for the team and works hard. It is suggested that the reason for his change in attitude is because he likes Se-young.
Supporting Dreams office • Son Jong-hak as Go Kang-seon, CEO of the Dreams team. •
Lee Jun-hyeok as Go Se-hyeok, scout team leader. • Yoon Byung-hee as Yang Won-seop, scout team member. • Kim Do-hyun as Yoo Kyeong-taek, analysis team leader. • Kim Soo-jin as Lim Mi-seon, head of marketing team. • Park Jin-woo as Byeon Chi-hoon, marketing team leader. • Kim Ki-moo as Jang Woo-seok, scout team deputy head.
Dreams players • Hong Ki-joon as Jang Jin-woo, the oldest
pitcher. •
Chae Jong-hyeop as Yoo Min-ho, a rising pitcher. •
Jo Han-sun as Lim Dong-gyu, a
cleanup hitter. • Cha Yup as Seo Yeong-joo, the chief catcher. • Kim Dong-won as Kwak Han-young, an
infielder.
Dreams coaching staff • Lee Eol as Yoon Seong-bok, the
head coach. • Son Kwang-up as Choi Yong-goo, the
pitching coach. • Kim Min-sang as Lee Cheol-min, the
bench coach. • Seo Ho-chul as Min Tae-seong, the
batting coach.
Baseball officials •
Lee Dae-yeon as Kim Jong-moo, general manager of the Vikings. • Song Young-kyu as Oh Sang-hoon, general manager of the Pelicans. •
Park So-jin as Kim Yeong-chae, a
sports announcer. •
Ha Do-kwon as Kang Doo-gi, the national team's ace pitcher. •
Kim Kang-min as Lee Chang-kwon, Vikings player.
Others •
Kim Jung-hwa as Yoo Jeong-in, Seung-soo's ex-wife. •
Yoon Sun-woo as Baek Yeong-soo, Seung-soo's little brother. An expert in
sabermetrics, he uses a wheelchair due to a baseball injury as a teenager. •
Yoon Bok-in as Jeong Mi-sook, Se-yeong's mother. • Jun Gook-hwan as Kwon Il-do, Jaesong Group chairman. • Lee Kyu-ho as Cheon Heung-man, a former wrestler who knows Seung-soo. •
Lee Yong-woo as Gil Chang-joo / Robert Gil, a translator and a disgraced former pitcher. •
Moon Won-joo as Kim Ki-beom, retired dreams player
Special appearances •
Lee Je-hoon as Lee Je-hoon, CEO of PF Soft (Ep. 16) •
Pengsoo as Pengsoo (Ep. 16) ==Production==