During Bo and Cheong's wedding reception, a video clip intending to show their journey of love suddenly flashes a clip of Cheong being intimate with another woman. This leads to the cancellation of the wedding. A year has passed and the single Bo and flirty Cheong maintains their relationship as good friends. One day, the womanizer Cheong brings the conservative Bo to a wife swapping party, at the party, they meet Kit and his wife Man Lai. The four developed a romantic and passionate relationship.