One night, Jia Jia, who is obsessed with the supernatural, drew some strange symbols on the floor in an attempt to practise a ritual to bring back her dead boyfriend, Sam. Nevertheless, Sam felt Jia Jia’s call, and came back to the world. Jia Jia hopes to relive the happy days with Sam again, just like before. But she gradually realises that Sam is actually from the future - an alien from a mysterious planet…