First you are given an actor and an actress with a random series each. But the the actor and actress must have been paired together before.
For example:
Gallen Lo - Golden Faith. (Seven Sisters) Charmaine Sheh - Dance of Passion.
Then you'll take an actress/actor from the actor's series (in this case Gallen's - Golden Faith). And take an actor/actress from the actress's series (in this case Charmaine's - Dance of Passion). The NEW actor and actress must have been paired together (note this in brackets). Also give them each a random series.
For example: Jessica Hsuan - A Recipe for the Heart. (Invsible Journey) Bowie Lam - Healing Hands.
So, next: Jessica Hsuan - A Recipe for the Heart. (Invsible Journey) Bowie Lam - Healing Hands.