There is a Japanese movie stuck in my head:
It's about a young man, who delivers flyers (coupons, advertising maybe?) around the city, and he sometimes breaks into flats and houses that he can see are empty (because the flyers are still in the mailbox).
One time he breaks into a house, without realizing a woman is still inside. Eventually they fall in love (I think?), but the husband of the women finds out and he gets arrested (not sure how, but he ends up in jail).
When in jail, the young man practices "shadowplay" skills, where he lingers in peoples blind spots, and therefore can "disappear". He returns to the house, to live together with the woman, by living in the blindspot of the husband.
This all rather vague, but if someone knows which movie I'm talking about, that would be awesome!