Main •
Park In-hwan as Shim Deok-chul : Deok-chul is a retired mailman who has just celebrated his 70th birthday. Seeing how his friends started to regret dreams they could not pursue in their younger age, he decided to try to fulfill his long-life dream of becoming a ballerino. He meets Lee Chae-rok after accidentally seeing him practicing for his upcoming ballet competition. •
Song Kang as Lee Chae-rok : Chae-rok is a 23-year-old ballerino who is struggling financially and tries to support himself by working as a part-timer at a café. His deceased mother was a ballerina, whilst his father Lee Moo-young was in jail. His passion for ballet has started to fade away as he is having a hard time in living. Everything started to change slowly after he meets Shim Deok-chul. •
Na Moon-hee as Choi Hae-nam : Hae-nam is Deok-chul's wife, who cares deeply for her family. Initially, Hae-nam disapproved of her husband's ballet dreams, but supports him after seeing how passionate he is. •
Hong Seung-hee as Shim Eun-ho, Deok-chul's granddaughter who is currently working as an intern at the same café as Chae-rok. She eventually becomes friends with him.
Supporting •
Jo Sung-ha as Lee Moo-young, Chae-rok's father who used to be a soccer coach at his school before going to jail. He was released recently and lives apart from his son to make a living. •
Kim Tae-hoon as Ki Seung-joo, Chae-rok's ballet teacher who owns Ballet Studio. He seems to be strict and short-tempered, but actually cares about his students very much. •
Shin Eun-jung as Kim Ae-ran, Eun-ho's mother and daughter-in-law of Deok-chul. •
Jung Hae-kyun as Shim Sung-san, Eun-ho's father and Deok-chul's first son. He aggressively opposes his father taking ballet lessons. •
Kim Soo-jin as Shim Sung-suk, Deok-chul's daughter and wife of struggling politician Young-il. •
Yoon Ji-hye as Eun So-ri, Seung-joo's ex-wife who is a ballet teacher at Hankuk University of Arts Dance School. • Lee So-yeong as Anna Yoo, a pianist at Ballet Studio. •
Jung Hee-tae as Young-il, Sung-suk's husband who is a politician. • Jo Bok-rae as Shim Sung-gwan, Deok-chul's second son who quit being a doctor and is struggling in pursuing his dream of becoming a film director. •
Kim Hyun-mok as Kim Se-jong, Chae-rok's friend since their school days, also his fellow part-timer at a café. •
Seo In-guk as Hwan-hee •
Kim Kwon as Yang Ho-beom, Chae-rok's former friend who now resents him after the latter's father beat him up, claiming that he does not deserve to live a good life. ==Original soundtrack==