a guy finds out that his girlfriend used to date his brother

After standing in as best man for his longtime friend Carl Petersen, Randy Dupree loses his job, becomes a barfly and attaches himself to the newlywed couple almost permanently -- as their houseguest. But the longer Dupree camps out on their couch, the closer he gets to Carl's bride, Molly, leaving the frustrated groom wondering when his pal will be moving out.

During a wild vacation in Las Vegas, career woman Joy McNally and playboy Jack Fuller come to the sober realization that they have married each other after a night of drunken abandon. They are then compelled, for legal reasons, to live life as a couple for a limited period of time. At stake is a large amount of money.

Its guys weekend in Vegas, where anything can happen. What happens in Vegas, stays in Vegas.

While it might be OK for a step sister to have an innocent crush on her step-brother's girlfriend... the question is asked, 'is it OK to act on those urges?'

The brother of this guy used to have Tsukasa Aoi as a girlfriend. The thing about the brother is that he was a well-known womanizer and whore-goer, so he passed all that knowledge to the girlfriend Aoi. But nowadays they are not together anymore, and this guy quickly realizes that she is a full-blown slut. So the question that remains is, will he cross the line and go where his brother has been before?

Gangseo, while having sex with his girlfriend these days, often thinks about her older sister. He always blames himself for being a pervert, but he just can't help it. One day he saw a sexy performance, and his body reacted instinctively. One day, Kang-seo listened to the sound of his older brother, Chan-jun, and his quarrel after sex. From Chan-jun's own words, he finds out that the performer is a room salon waitress...

When a young man with a questionable romantic past goes to dinner to meet his girlfriend's parents for the first time, he quickly realizes that he already knows her sister -- more than he should.