After losing her boyfriend in a plane crash Yu-Hsuan is overwhelmed with grief and remorse. One day she is gifted a Walkman by a mysterious figure. She falls asleep on a bus while listening to her favorite song and accidentally travels back to 1998 into a teenage schoolgirl's body only to realize she will be killed on Xiao Nian Ye 1999. It is a race beyond time to find out who the culprit is before the tragedy repeats itself.