It's 3 minutes for hearers, but a life for the callers. A crime thriller chasing even the slightest sounds to rescue people's lives calling for urgent help.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Episode 1 | 2017-01-14 | 60 min |
| Season 1 | Episode 2 | Episode 2 | 2017-01-15 | 60 min |
| Season 1 | Episode 3 | Episode 3 | 2017-01-21 | 60 min |
| Season 1 | Episode 4 | Episode 4 | 2017-01-22 | 60 min |
| Season 1 | Episode 5 | Episode 5 | 2017-02-04 | 60 min |
| Season 1 | Episode 6 | Episode 6 | 2017-02-05 | 60 min |
| Season 1 | Episode 7 | Episode 7 | 2017-02-11 | 60 min |
| Season 1 | Episode 8 | Episode 8 | 2017-02-12 | 60 min |
| Season 1 | Episode 9 | Episode 9 | 2017-02-18 | 60 min |
| Season 1 | Episode 10 | Episode 10 | 2017-02-19 | 60 min |
| Season 1 | Episode 11 | Episode 11 | 2017-02-25 | 60 min |
| Season 1 | Episode 12 | Episode 12 | 2017-02-26 | 60 min |
| Season 1 | Episode 13 | Episode 13 | 2017-03-04 | 60 min |
| Season 1 | Episode 14 | Episode 14 | 2017-03-05 | 60 min |
| Season 1 | Episode 15 | Episode 15 | 2017-03-11 | 60 min |
| Season 1 | Episode 16 | Episode 16 | 2017-03-12 | 60 min |
| Season 2 | Episode 1 | Episode 1 | 2018-08-11 | 80 min |
| Season 2 | Episode 2 | Episode 2 | 2018-08-12 | 60 min |
| Season 2 | Episode 3 | Episode 3 | 2018-08-18 | 60 min |
| Season 2 | Episode 4 | Episode 4 | 2018-08-19 | 60 min |
| Season 2 | Episode 5 | Episode 5 | 2018-08-25 | 60 min |
| Season 2 | Episode 6 | Episode 6 | 2018-08-26 | 60 min |
| Season 2 | Episode 7 | Episode 7 | 2018-09-01 | 80 min |
| Season 2 | Episode 8 | Episode 8 | 2018-09-02 | 60 min |
| Season 2 | Episode 9 | Episode 9 | 2018-09-08 | 60 min |
| Season 2 | Episode 10 | Episode 10 | 2018-09-09 | 80 min |
| Season 2 | Episode 11 | Episode 11 | 2018-09-15 | 60 min |
| Season 2 | Episode 12 | Episode 12 | 2018-09-16 | 60 min |
| Season 3 | Episode 1 | Episode 1 | 2019-05-11 | 80 min |
| Season 3 | Episode 2 | Episode 2 | 2019-05-12 | 80 min |
| Season 3 | Episode 3 | Episode 3 | 2019-05-18 | 80 min |
| Season 3 | Episode 4 | Episode 4 | 2019-05-19 | 80 min |
| Season 3 | Episode 5 | Episode 5 | 2019-05-25 | 80 min |
| Season 3 | Episode 6 | Episode 6 | 2019-05-26 | 80 min |
| Season 3 | Episode 7 | Episode 7 | 2019-06-01 | 80 min |
| Season 3 | Episode 8 | Episode 8 | 2019-06-02 | 80 min |
| Season 3 | Episode 9 | Episode 9 | 2019-06-08 | 80 min |
| Season 3 | Episode 10 | Episode 10 | 2019-06-09 | 80 min |
| Season 3 | Episode 11 | Episode 11 | 2019-06-15 | 80 min |
| Season 3 | Episode 12 | Episode 12 | 2019-06-16 | 80 min |
| Season 3 | Episode 13 | Episode 13 | 2019-06-22 | 80 min |
| Season 3 | Episode 14 | Episode 14 | 2019-06-23 | 80 min |
| Season 3 | Episode 15 | Episode 15 | 2019-06-29 | 80 min |
| Season 3 | Episode 16 | Episode 16 | 2019-06-30 | 80 min |
| Season 4 | Episode 1 | Episode 1 | 2021-06-18 | 80 min |
| Season 4 | Episode 2 | Episode 2 | 2021-06-19 | 80 min |
| Season 4 | Episode 3 | Episode 3 | 2021-06-25 | 80 min |
| Season 4 | Episode 4 | Episode 4 | 2021-06-26 | 80 min |
| Season 4 | Episode 5 | Episode 5 | 2021-07-02 | 80 min |
| Season 4 | Episode 6 | Episode 6 | 2021-07-03 | 80 min |
| Season 4 | Episode 7 | Episode 7 | 2021-07-09 | 80 min |
| Season 4 | Episode 8 | Episode 8 | 2021-07-10 | 80 min |
| Season 4 | Episode 9 | Episode 9 | 2021-07-16 | 80 min |
| Season 4 | Episode 10 | Episode 10 | 2021-07-17 | 80 min |
| Season 4 | Episode 11 | Episode 11 | 2021-07-23 | 80 min |
| Season 4 | Episode 12 | Episode 12 | 2021-07-24 | 80 min |
| Season 4 | Episode 13 | Episode 13 | 2021-07-30 | 80 min |
| Season 4 | Episode 14 | Episode 14 | 2021-07-31 | 80 min |
| Directing | Shin Yong Hwi | Director |
| Writing | Ma Jin-won | Writer |
