Good luck sleeping after you watch this gruesome horror thriller on Netflix

Netflix has found considerable success by investing more in Korean content in recent years. By giving subscribers such hit shows as Crash Landing on You, Vincenzo, and It's Okay to Not Be Okay -- with the list of must-watch Korean dramas and movies getting so much longer as the weeks go by. Among the many hotly-anticipated future additions to this category on Netflix, a Korean remake of the Spanish-language original Money Heist is also coming to the streamer soon. Meantime, another super popular Korean franchise is the Netflix Kingdom series, which just brought fans something new in recent weeks: A standalone, feature-length "side-sequel." One that sits between Season 2 and 3 of the series, at the heart of which is a zombie outbreak following events during Korea's Joseon Dynasty (from 1392 to 1897).