Coma (2006)

Behind the doors of Namwon Hospital lies a chilling secret, one that the hospital’s inhabitants have kept buried for the last 10 years, and all centered around one coma patient, Lee So Hee. With the hospital’s reputation steadily declining from countless medical accidents over the years, it is forced to shut down. However, as the hospital closes its doors, another opens, and secrets that have long been hidden come out with avengeance.
(Source: DramaWiki)