Busted! Darklord

Yu Renjie, the son of a demon lord, is sent to Hero's Academy, which enrolls only the most esteemed and virtuous students. His goal is to earn a Hero's Certificate, but this comes with a huge risk: if his demonic affiliation is discovered, he'll be killed on sight by the righteous knights. Yu Renjie's situation becomes even more complicated when his personal information is leaked, forcing him to disguise himself as a woman to avoid detection.