BUS is a psychological–spiritual love story about May, an amnesiac ghost trapped between life and death. Guided by An, a mysterious bus driver, she slowly recovers her memories and uncovers a devastating truth: the mother of Vu—the man she loves—caused her death. As love, guilt, and trauma collide, May and Vu are forced to confront the past, where forgiveness may offer release, but love becomes the greatest obstacle to moving on.