The Sound of the Piano in the Middle of the Night: a Life-Threatening Ballad in the Old School Building

On the first day when transfer student Su Wan entered the century-old school, she heard the legend - when the piano in the old school building sounded at midnight, she had to cover her ears and count to seven, otherwise she would be chosen by "her". Su Wan didn't believe it until she saw with her own eyes the shadow wearing red dancing shoes waving to her behind the music classroom window at two o'clock in the morning.