Before: Takeshi is a shy boy who enjoys being a garbage collector on night shift, a time in which he can have the whole street to himself. He cannot recall how the whole thing happened, but one night he finds himself watching the teenage sleepwalker Li Wei-wei, and he realizes he wants to keep seeing her. He doesn't understand that this is love. The world of a clear-minded boy and the world of a sleepwalker girl begin to merge. The girl soon wakes up from her sleepwalking, and wants to know everything about those hours. Meanwhile, the boy is enjoying himself so much he can no longer tell dreaming from being awake.

After: Karen is the lonely woman who dominates the heart of Eric. The two have been lovers, a very passionate first love. The sort of love that marks you with an aftermath that you won't begin to understand until long after it happens. Eric used to think he got over that love. He got married. It isn't until he sees Karen one day that he senses something is wrong. The precision of the pain makes him wince, in a part of himself he thought he had long ago cut off and thrown away. Between their past and present, a man and a woman struggle to find an end to their first love.