
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.

as Hae-Gwan

as Sori (voice)

as Ji-yeon

as Yoo-joo

as Jin-ho

as Goo-cheol

as Underground Singer

as President Go

as Hyeon-soo

as Hyun-sook

as Yoo Sung-jin

as Jang Geun-yeong

as NIS agent

as NIS agent

as NIS agent

as Police

as U.S. military officer

as Grandmother

as Yoo-joo's Friend