Naughty Girlfriend

Original title: 야한 여친

Young-ran is getting married to Beom-soo in a month. To test her man, she encourages her friend Yoon-ji to seduce him, but Yoon-ji has secretly liked him for a while. Finding her chance after a few drinks, Yoon-ji sleeps with Beom-soo, which Young-ran witnesses in shock...