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In a world where an AI programme allows people to communicate with their deceased loved ones, a flight attendant and a mother question the meaning of reality and humanity.
Bae Suzy
Koo Jeong-in
Park Bo-gum
Park Tae-ju
Jung Yu-mi
Seo Hae-ri
Choi Woo-shik
Kim Hyun-soo
Gong Yoo
Sung-jun
Tang Joon-sang
Choi Jin-gu
Seong Byeong-suk
Song Jeong-ran
Choi Moo-seong
Lee Yong-sik
Kang Ae-sim
Hae-ri's Mother
Min Ji-a
Tae-ju's Doctor
Park Mi-hyun
Hyun-mi
Jeon Su-ji
Jeong-in's Colleague on the Subway
Jeon Woon-jong
Senior Purser
