The Teacher Who Sees All Secrets

Han Seo-jun was nothing more than a humble contract teacher at Haneul High School, until his world collapsed overnight when he blew the whistle on the sweeping corruption of foundation chairman Cha Dong-hyun. Falsely accused of sexual assault, Seo-jun lost it all and decided to take his own life. But fate hurled him back in time instead, six months before his ruin started. This time, Seo-jun isn't fighting alone. A mysterious system bestows on him the remarkable power to expose every dark secret buried inside his school. Up against the school's scheming ruler, can the teacher make use of the time left to flip the script and claim his revenge?