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.

Cast: Lee Sung-min, Shim Eun-kyung, Lee Hanee, Chae Soo-bin, Lee Hee-jun, Kim Won-hae