Black Light

Original title: 빛과 철

“As she comes close to the truth, unwanted secrets come out.”

After a car accident leaves one man dead and another in a coma, it's believed that the dead man was at fault. Guilt-ridden, his wife, Hee-ju, struggles to move forward. She ends up learning that the victim had previously tried to kill himself. Suspecting the accident may have been on purpose, she begins an investigation.