Black Light (2020)

A car accident happened. One died, and the other went into a coma. The case was concluded as the dead one’s fault. Being guilt-ridden, the dead man’s wife, Hee-ju struggles to move forward. One day, she learns that the victim tried to kill himself before the accident. Suspecting that the accident might be caused by the victim on purpose, she starts to reinvestigate the case all over again.