Title(s) AKA: Summertime
Film Director(s): Park Jae Ho
Released: 2001 [Korea]
Genre: Erotica
    Sub-Genre: Fantasy
 
Overview:
Sang-ho happens to peep through a hole in a worn wooden house and watch a married couple as they engage in sex. Without knowing it, he gets excited and as a consequence he starts to masturbate. At first, he feels guilty and ashamed, but the young man grows more and more addicted to watching them in secret. Then, seizing a moment when the husband is not home, Sang-ho goes downstairs. Imitating the husband's manner of foreplay even down to the sequence, the young man has sex with the wife. The film, Summer Time, depicts the secret desire of humans so realistically and honestly that it makes you quiver.

Cast:
Kim Ji Hyun, Ryu Soo Young, Choi Chul Ho. . 
 
taken from: http://www.hkflix.com/xq/asp/filmID.2222/qx/details.htm
 
IMO:
aiya the overview never say clearly one, only say about the voyeurism nia... actually the peeping tom lives upstairs and the couple live directly below... the peeper doesnt live there really, it was just a temp. shelter for him to hide from the police as he was a student demonstrator on the wanted list... and the couple has an interesting story, the husband always locks the outside of his door whenever he goes out for work, meaning he locked his wife inside... his wife very very seldom go out, always stay at home lying in bed, dancing around, waiting for husband to come home for sex...
 
the peeper managed to get the keys to the couple's house when the husband clumsy fall down then the keys slipped out but he never see, then the peeper go n kapok loh...
 
the reason why the wife duno that the peeper is having sex with her is becos the husband always do it from behind... then the peeper oso do it from behind to make her tink is her husband when actually its otherwise...
 
and the couple first met when he raped her while he was trying to catch her father who was a teacher... he thought the father is the instigator of the student riots but then only his daughter at home only... so man n woman alone, duno each other, the guy go n rape her from where else but behind... thats y they never have sex in the normal position... i oso duno y the ger go n marry him... he gives gd sex?