One Day (2016) online

Insurance examiner Gang-Soo (Kim Nam-Gil) falls into a deep depression in the wake of the death of his beloved wife. As he returns to work, he takes on the case of Mi-So (Chun Woo-Hee) whom is laying in a coma in the hospital. Gang-Soo meets a woman there who introduce herself as Mi-So, and it turns out that he is the only one capable of seeing her. It turns out that Mi-So has been in a terrible car accident and while her body is deep in a coma, her spirit is roaming free. And Mi-So has something that she needs Gang-Soo to do for her.