So Jolin is 暴能特區Cyphers' spokesperson, but also the embodiment of the character Trivia (her name in Chinese: 特莉薇亞), the Queen of the Night. From what I've read she's a "sexy vampire".
This game is the Taiwanese version of the Korean online game "Cyphers Online".
Jolin will appear as Trivia in the game's CF and also attend Cyphers' events.
We have a promo picture already, I'll add to it a picture of the character she's portraying.
Click on the pictures to enlarge.