I seriously fail to understand why an established actor like Ji Chang Wook took up a drama like this which fails to fall in either Fantasy, Romantic, Time travel or Sci - Fi genre. It is more like a scientific experiment gone wrong...
I really liked many of Ji Chang Wook's previous dramas like Healer, Empress Ki and even The K2. After a seriously okayish Suspicious Partner in 2017, He returned with this dud in 2019. There were so many hopes pinned on this drama by his fans which was touted as his comeback after military stint of 2 years.
Ji Chang Wook looks disinterested and has a dead pan expression throughout in most of the scenes and the chemistry between the leads is visible only in the later episodes.
Rewatch value? This drama doesn't even have 'watch it once' value.
Do yourself a favour and please skip this one!