A Day (film)

A Day is a 2017 South Korean mystery thriller film directed by Cho Sun-ho, starring Kim Myung-min and Byun Yo-han.
Plot.
The story starts with a doctor, Kim Joon-young, returning home. His daughter, Eun-jung, dies in a car accident on the same day along with another woman. Kim Joon-young wakes up with the day repeating. He tries to save his daughter but fails, with the day repeating over and over again. The woman's husband also experiences the day repeatedly. They cannot seem to save their loved ones no matter what. Later, they find out that the father of a child whose heart was transplanted without the father's consent and the man who had caused an earlier accident are the two persons whose day is repeating, along with the child father, who is seeking revenge by killing their loved ones. They reconcile to the father after learning that his child's heart is inside of the daughter. Thus, the son does not allow his father to die so they save him so that everything returns to normal. The doctor explains the transplant to the press as the movie ends.
Production.
"A Day" reunites the two main actors Kim Myung-min and Byun Yo-han who previously acted together in the historical drama series "Six Flying Dragons".