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Overview
After a tragic fall claims the life of Park Won-seok, his twin sister Ok Chan-mi suspects foul play rather than suicide. Determined to uncover the truth, she enrolls at Yongtan High, where her brother's death occurred. There, she connects with Ji Soo-heon, a witness to the incident. Amidst the turmoil, a mysterious avenger emerges, targeting bullies at the school. Chan-mi's investigation leads her to believe this vigilante may hold the key to understanding her brother's demise, spurring her on a quest for justice and answers in a world filled with secrets.