An aspiring violinist and a professional translator live parallel lives and appear to be perfect for each other, but somehow fate seems to keep them apart. Living in different units of the same apartment building, they never meet, because when they leave, one turns left, and one turns right.

May is a martial artist and Chinese medicine practitioner who resides in a temple in Omei mountain. Under the threat of her lovelorn master, Misery, she decides to seek the help of infamous womanizer, Tiger Hung, who she had helped earlier, in order to experience heartbreak and master the "Heartbroken Sword" technique to defeat her.

Kung and Kin's rivalry goes way back to the seventies when they fought over the same girl, who eventually became Kung's wife. Now they run competing phone stores right across from each other on Mongkok's busiest street, and stretch their minds trying to outdo each other with crazy promotions.

A criminal, a bank clerk and a police officer find their destinies entwined when a loan shark gets assaulted after having withdrawn $10 million from the bank in the midst of the world financial crisis.