Chinese Feng Shui master, Carson (Chapman To) was a real ladies' man, besides his first love, Karen Ho (Kimmy Tong), he had never been in a stable relationship. Carson was a "Natural Born Player", taking names and breaking hearts. Fate had it that he would meet his match, the hot veterinarian, Chi-Ling (Chrissie Chau). It was love at first sight, but neither could stand the other's fickle nature lest the affair might have ended as soon as it began. Chi-ling's roommates, Big S (Iris Chung) and Small S (Jeanette Leung) came up with a perfect plan – to invite Carson to move in with Chi-Ling and make him promise to have no sexual contact with any girls for 100 days, if he could hold out, it would mean Chi-Ling had a special place in his heart. Carson accepted the challenge without a second thought, but it turned out to be a lot harder than it sounded, especially when the two sisters and his ex-lovers took turns in seducing him. Ninety difficult days have since passed, the biggest temptation arrived in the form of the hottest bachelor in Hong Kong, Simon Li (Wilfred Lau) began courting Chi-Ling. At the same time, Karen, Carson’s first love, suddenly came back into his life. Would these star crossed lovers cross the finish line together?