纱季是一个美丽的高中女生，因母亲吸毒卖淫入狱，为营救其母作为交换条件，私下与日本政府警厅作一个特殊合作，是扮演学生卧底警察，穿白色有警徽的透明内裤，手持溜溜球神秘武器，暗中调查学生卖淫集团，并当诱饵，以拘捕变态的强奸男子。纱季的同学沙纪爱上了一个男孩，却被虐待强迫加入卖淫集团，不从後被杀害。纱季好友同学「妓女飞鸟」也离奇被杀害， 於是纱季决定进入淫窟，卖淫集团是由校长和老师所操控，纱季发誓要查出行凶坏蛋，彻底摧毁卖淫集团。纱季的武器是溜溜球，她的战斗口号是“我永远不会原谅你！

对于安东尼（斯科特·麦克洛维茨 Scott Mechlowicz 饰）来说，成为一名成功的厨师是他的毕生志愿，怀揣着这个梦想，安东尼来到了南斯拉夫，准备在这里开一家小餐厅。没想到，不但餐厅没开成，安东尼还和偶遇的好友朱利安（阿方索·麦克奥雷 Alphonso McAuley 饰）一起干起了私家侦探的活计。众所周知，朱利安是个好色的花花公子，和这样的伙伴一起创业真的没有问题吗？ 一个名叫卡塔琳娜（帕兹·维嘉 Paz Vega 饰）的美艳女子出现在了安东尼和朱利安的面前，声称因为掌握了一份绝密的情报而身处危险之中，这两个连自身都难保的大男人能够保护卡塔琳娜吗？两人此时还不知道的是，他们已经成为了冷酷杀手海伦（珍妮·麦克蒂尔 Janet McTeer 饰）的下一个目标。

Two men love one woman. Seo-yeon chooses who to have a relationship with, every time. Jin-woo and Dong-hyeon competes with Seo-yeon's attention, but she doesn't think the setup is strange. Actually, there is a reason why she doesn't want to choose between the two. Who will win Seo-yeon's love in the end? The unending love story between the three is just beginning.

Ji-min, Hyeon-soo, and Woo-yeong, play together at Ji-min's house. Hyeon-soo happened to see Ji-min change her clothes while playing. Hyeon-soo, who secretly likes Ji-min, ran away excitedly after seeing Ji-min's skin. Woo-yeong, who saw Hyeon-soo like that, actually made a funny suggestion to Ji-min who was his sex partner. Ji-min calls Hyepn-soo and uses the fact that Hyeon-soo likes him to have sex. Hyeon-soo moves according to Woo-yepng's plan.

Yoo-jeong and So-hyeon are not real siblings but have lived together since childhood. So-hyeon is caught by Yoo-jeong spending time at home with her boyfriend. Min-soo saw Yoo-jeong naked in the bathroom. Yoo-jeong is interested in such Min-soo and seduces Min-soo. Min-soo knows that Yoo-jeong and So-hyun are not real sisters and approaches Yoo-jeong right away. So-hyeon finds out and So-hyeon breaks up with Min-soo. Min-soo played with two sisters...

Jun-ho and Min-soo, experience a hard time because of Da-hee who drinks whenever she breaks up with her boyfriend, but they still take care of her. But they heard that Da-hee is meeting her ex-boyfriend again. Actually, the two guys like Da-hee. They’re trying to make sure that Da-hee won't meet her boyfriend again. The love story between the two men, which is invisible to the eye, is just about to happen.

Three people clean up the house for Min-soo who is new to the house. Yeong-cheol, who has become close friends while living in one house, is obsessed with Seo-yeon because he does not like Min-soo. Seo-yeon knows the relationship between the two and has a strange confidence watching the fight between the two. The fierce fight between the two men trying to win the relationship with Seo-yeon before Min-soo enters the house! The story of the unknown end is just beginning.

Three childhood friends finally gathered. From the first meeting, it's not so bad. Na-yeong enters the house, angry at Min-hyeok and Jin-woo who broke their promise. After living apart for several years, they lived in one house. Three people who are childhood friends but not ordinary friends. When one person disappears, the secret between the two is revealed... Who can develop from a friend to a lover... The unknown story begins now.

Having been happily married to Jae-hyun, Na-yeon accidentally learns about Jae-hyeon's wishes from her former sex partner Min-woo. Na-yeon, who is a little nervous after hearing Min-woo's words, confirms with Jae-hyeon and spends another night with Min-woo in anger. Min-woo, who had long been interested in Na-yeon, now begins to approach her as a real man, not as a sex partner, and she begins to open her heart little by little. The love story of two men surrounding a woman is just beginning.