While desperately searching for his missing daughter, Hae-kwan comes across an AI satellite robot that remembers sounds from all over the world. Rejuvenated by the robot's abilities, Hae-kwan begins to track down his daughter's voice. As they continue their journey, they form an unforgettable bond.
Lee Sung-min
Hae-Gwan
Shim Eun-kyung
Sori (voice)
Lee Hanee
Ji-yeon
Chae Soo-bin
Yoo-joo
Lee Hee-jun
Jin-ho
Kim Won-hae
Goo-cheol
Ryu Jun-yeol
Underground Singer
Jeon Kuk-hwan
President Go
