Undercover High School S01E12 - Where the Stars Lead

Despite getting badly injured, Hae-sung manages to call Soo-ah and his team. They conclude that the only evidence they can secure is the flash drive that contains the voice recording of Principal Park murdering Director Kim Hyung-bae. After finding out that an arrest warrant had been issued for her, Seo Myung-joo decides to take a special measure to end everything.