Director Yeon Sang-ho, known for hit thriller series "Hellbound" and groundbreaking zombie flick "Train to Busan," said he aimed to explore the true meaning of coexistence and dynamics between individuals and organizations in "Parasyte: The Grey," his latest Netflix original series. "Parasyte: The Grey" narrates the story of Jung Soo-in (Jeon So-nee), who is partially turned in.