In 2017, a student investigates mysterious incidents while aliens invade the planet; meanwhile in 2037, a detective investigates a murder in the alien-controlled "Smart Earth."
EPISODE 1
Episode 1
Serial murder occurs at Handam University; a mysterious murder occurs in Smart Earth and Joon-hyuk enters.
EPISODE 2
Episode 2
Woo-jin learns that the woman and he go to the same school; Joon-hyuk often collides with Ho-soo.
EPISODE 3
Episode 3
Woo-jin suspects Jung-yeon as the murder suspect; Ho-soo blocks Joon-hyuk's plan in General Earth.
EPISODE 4
Episode 4
Spotting a bug resembling the one from a corpse, Woo-jin is in doubt; Joon-hyuk also has no memories.
EPISODE 5
Episode 5
Seeing the alien, Star is confused about herself; Joon-hyuk chases Blue Bird to find his twin.
EPISODE 6
Episode 6
Woo-jin misses Beom-gyun and searches for the ambulance; Joon-hyuk finds Woo-jin with Blue Bird.
Yeo Jin-goo
Gong Seung-yeon
Kim Kang-woo
Ahn Woo-yeon
Lee Gi-kwang
Jung-ki Kim
Song Young-kyu
Han Sang-jin
Min Jin-ki
Kim Jin-hee
Yoo Hye-mi
