Black Light (2020)

A collision occurs between two cars on a busy road. One man dies, the other goes into a coma. An investigation into the crash concludes that the dead man was at fault. Racked with guilt, the dead man's widow Hee-ju struggles to move on with her life. But when she discovers that the man in a coma had tried to kill himself before the accident occurred, she begins to suspect that he might have have caused the crash on purpose and her husband was innocent after all. She starts to reinvestigate the events.