| 27 November 2020 | US | Yes | ||
| 31 March 2020 | South Korea | Yes |
| Crime | |
| Horror | |
| Mystery | |
| Science Fiction | |
| Thriller |
| South Korea |
| Korean |
| South Korea |
| imdb | tt10530176 |
| Name | Role/Job | Order of appearance | Options | |
|---|---|---|---|---|
| 1) | Park Shin-hye | 1 | ||
| 2) | Jeon Jong-seo | 2 | ||
| 3) | Kim Sung-ryung | 3 | ||
| 4) | Oh Jung-se | 4 | ||
| 5) | Lee Dong-hwi | 5 | ||
| 6) | Lee El | 6 | ||
| 7) | Eugene Ko | 7 | ||
| 8) | Grace Lynn Kung | 8 | ||
| 9) | Ryu Kyung-Soo | 9 | ||
| 10) | Jonny Siew | 10 | ||
| 11) | Park Ho-San | 11 | ||
| 12) | Moon Chang-gil | 12 | ||
| 13) | Kyeong-sook Jo | 13 | ||
| 14) | Yo-sep Song | 14 | ||
| 15) | Um Chae-young | 15 |
| Name | Role/Job | Order of appearance | Options | |
|---|---|---|---|---|
| 1) | Chung-Hyun Lee | Writer | 1 | |
| 2) | Sergio Casci | Screenwriter | 2 |
| Name | Role/Job | Order of appearance | Options | |
|---|---|---|---|---|
| 1) | Netflix | Producer | 1 |
| Name | Role/Job | Order of appearance | Options | |
|---|---|---|---|---|
| 1) | Chung-Hyun Lee | Director | 1 |
| Name | Synopses | Official ? | Options |
|---|---|---|---|
| Shaimaa Saied | The story of two girls who live in two different periods of time; Seo-yeon lives in the present, while Young-sook lives in the past, and they are linked by one phone call that changes their lives. 197 |
| Name | Review Content | Spoiler ? | Official ? | Options |
|---|