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
