[3] The series takes place in a small Russian town where a deadly virus appears.

The director is Andrey Proshkin, the creative producer is Boris Khlebnikov.

[6] The script was written by Alexander Lungin, Roman Volobuyev and Elena Vanina.

Filming took place in November–December 2020 in the Chelyabinsk Oblast (mainly in Zlatoust, as well as in Miass and Satka).

[9] In April 2023 filming of the second season began, which took place in Moscow and the Orenburg region.