"Triple" revolves around the world of ice skaters and advertising execs.  Lee Ha-Ru (Min Hyo-Rin) is a figure skater. At the age of 6, Ha-Ru's mother remarried and Ha-Ru got a new step brother named Shin-Hwal. At the age of 13, Ha-Ru lost her mom and step-father in a fatal car accident. Since then, Ha-Ru and Shin-Hwal separated with Ha-Ru moving away to the countryside to live with her grandfather.  As an adult Ha-Ru moves back to Seoul to pursue her ice skating career. Ha-Ru moves in with her step-brother Shin-Hwal, who also has two two other roommates. Jo Hae-Yun (Lee Sun-Kyun) & Jang Hyeon-Tae (Yoon Kye-Sang) are his roommates and they all work together in the same advertisement company. Ha-Ru then starts to fall in love with her step brother Shin-Hwal ...