In My Sister is The Warlord Queen Episode 27, just when Catherine was in a difficult situation, a man named Kalvin appeared. He mistook Catherine for Grace and claimed that he was Grace's old classmate who had once pursued her but was rejected. He assumed that Grace was currently working as a cleaner and thought that if top student Grace had accepted him back then, she wouldn't have ended up in such a situation. Will Catherine reveal her true identity to Kalvin?
