Sarah, a young girl living in the dark shadow of her past, could never forget the tragedy that struck when she was in middle school—her mother died in a motorcycle accident. Since then, guilt had haunted her every step, trapping her in endless regret. Hoping to atone for her perceived sins, Sarah repeatedly tried to find ways to communicate with her mother’s spirit, but all her attempts ended in failure. One day, however, a mysterious man—also a student at the same university—offered her a secre...