OCN drama series “Strangers From Hell” (literal title) starring Im Si-Wan and Lee Dong-Wook. The two teaser trailers features Im Si-Wan as Yoon Jong-Woo. He moves into a (creepy) apartment building in Seoul. Both of the teaser trailers has Im Si-Wan narrating “Here is hell. A horrific hell made by strangers.”
 
In addition, “Strangers From Hell” is scheduled to first air August 31, 2019 in South Korea (takes over OCN’s Saturday and Sunday 10:20 PM time slot after “Watcher“).