[2] A hard-hitting detective who fearlessly dives into his work, Seo Do-won (Yoon Shi-yoon) is relentless when it comes to bringing criminals to justice.

Seeking the help of his colleagues in both universes, Do-won asks Han Seo-kyung (Kyung Soo-jin), an honest, yet reserved prosecutor with a big heart in one world, and a cold and emotionless detective in the other, to help him out.

Together with Lee Jung-min (Shin So-yul), a tenacious member of the scientific investigation unit, they'll do whatever it takes to track down the killer in one world and protect his love in the other.

The series is available on iQIYI with multi-languages subtitles in South East Asia and Taiwan, Rakuten Viki in selected regions, and in the United Kingdom and Republic of Ireland via Sky Sci-fi and NOW.

[4] BBC Studios' Firebird Pictures has obtained the remake rights to the series, to be readapt with the British setting.