This is from an interview from a China newspaper with South Korea's consul-general, Mr Kim Jong-kee (I'm not sure of the correct spelling of his name). I only translated the part related to SuJu.

QUOTE
Q: Due to the influence of hallyu, quite a number of Korean stars are famous in China. I guess all of us are curious, during the Shanghai World Expo, which Korean stars can we expect to see?

A: Talking about popular stars, we have indeed invited a lot of artistes, hoping that they can surprise the visitors to the Korean Pavilion during the six-month period. However, up till now, only Super Junior and Rain are confirmed to attend.

original source: nddaily
translated by: autonomygirl @ sj-world.net
please credit if taking out

The Expo will be held in Shanghai from May 1 to Oct 31, 2010. More info here: http://en.expo2010.cn/