阿里（Mikko Nousiainen 饰）是一名急救医生，在工作上恪尽职守的他在感情上却有着完全相反的癖好。每天下班后，阿里便来到灯红酒绿之处，穿梭在如云的美女之间寻找他今夜的枕边人。是的，阿里热爱一夜情，他的情，也仅有一夜。一次偶然中，阿里结识了缇娜（劳拉·马尔米瓦拉 Laura Malmivaara 饰），缇娜的美丽和温柔让阿里放弃了自己的原则，两人开始了交往。 　　在缇娜的心中，阿里是一个忠诚的伴侣，亦是她托付终身的不二选择，于是，缇娜将朋友伊莲娜（Matleena Kuusniemi 饰）和汉娜（Irina Bjorklund 饰）等人介绍给了阿里。没想到，正是缇娜的这一举动酿成了日后的悲剧，阿里竟然对她的朋友们出手了。An old dog has a hard time learning new tricks in this drama set in Turku. Ari, a paramedic, is a chronic womanizer; he makes it a point of pride to never sleep with the same woman twice, and his nights are a long series of brazen one-night stands. But when Ari meets Tiina (Laura Malmivaara), something unexpected happens - he falls in love. For the first time, Ari finds himself pursuing a long-term relationship, and he makes a genuine effort to remain faithful to her. But old habits die hard; Tiina introduces Ari to her circle of friends and temptation arises as he encounters Hanna-Riikka, a theology student, and Ilona, who is soon to be married. Despite Ari's feelings for Tiina, he begins having affairs with both Hanna-Riikka and Ilona, leading to an unpleasant revelation on the day of Ilona's nuptials.