It tells a romantic but forbidden love story between teacher and student. Hsu Wei-ning, the leading actress, portrays Chen Mengyun, a Chinese teacher at high school. Edward Chen portrays the naughty student Zhang Yixiang who was excellent at math and Hsueh Shih-ling, who recently won the Golden Bell Award for Best Leading Actor, portrays Li Dawei, the kind-hearted dean. At a happy school festival, Chinese teacher Chen Mengyun (Hsu Wei-ning) fell in a corner of the campus, looking at the knife stabbed in her abdomen in disbelief. 17-year-old math genius Yixiang (Edward Chen) was standing in front of her, looking sad and worried. The forbidden love story between teacher and student was revealed accidentally via globally available live streaming.