Luhan's co-star, Yang Zishan, posted an entry on her weibo with a group photo of the Back to 20 cast with Vicki Zhao.
Translation of her post: You appeared when I was just thinking of you! It was so late, far away and tiring, but you still rushed over from Shunyi Filming venue! It's so blissful to hug you! My good friends here are so shy! (she tagged Luhan, the director and Wilson Chen Bolin in her post).
credit: ceridwenlh @ LJ