"turtle in a vase?"

I watched that drama too, and from what I gathered he was alluding to sex. I think some people try to eat turtles to enhance their libido. (basically he was being a super creepy perv)

*edit* After looking it up, I found results about turtle eggs, not full grown turtles...

I believe this is a Mandarin idiom meaning trapped. You place a baby turtle in a vase, eventually the vase will be inescapable as the turtle grows to large to pass through the neck of the vase. Chen has been in the vase, the nasty old farts home since she was very young, and has had to endure his perversity to survive. In his mind she is trapped.