After Aliens arrive, the story takes place in two time streams: 2017 and 2037. In twenty years, and by 2037, the world has been divided into a “Smart Earth” where artificial intelligence has created a utopian environment in which no diseases or crimes exist, and an “Ordinary Earth” where people still suffer from rampant plague and lawlessness.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Episode 1 | 2017-05-22 | 72 min |
| Season 1 | Episode 2 | Episode 2 | 2017-05-23 | 63 min |
| Season 1 | Episode 3 | Episode 3 | 2017-05-29 | 66 min |
| Season 1 | Episode 4 | Episode 4 | 2017-05-30 | 60 min |
| Season 1 | Episode 5 | Episode 5 | 2017-06-05 | 59 min |
| Season 1 | Episode 6 | Episode 6 | 2017-06-06 | 59 min |
| Season 1 | Episode 7 | Episode 7 | 2017-06-12 | 66 min |
| Season 1 | Episode 8 | Episode 8 | 2017-06-13 | 63 min |
| Season 1 | Episode 9 | Episode 9 | 2017-06-19 | 59 min |
| Season 1 | Episode 10 | Episode 10 | 2017-06-20 | 64 min |
| Season 1 | Episode 11 | Episode 11 | 2017-06-26 | 60 min |
| Season 1 | Episode 12 | Episode 12 | 2017-06-27 | 60 min |
| Directing | Min Jin-gi | Director |
| Writing | Kim Jin-hee | Writer |
| Writing | Park Eun-mi | Writer |
| Writing | Ryu Moon-sang | Writer |
| Writing | Sang-yeon Park | Writer |
| Writing | Kim Young-hyun | Writer |
| Writing | Yoo Hye-mi | Writer |
