Mainland director Gao Qunshu's new film Beijing Blues, which won him best director at this year's Shanghai International Film Festival, will premiere on July 20.

The unique feature of his film is the actors - they are not professional but celebrities on micro blogs.

Among micro bloggers in the cast are publisher Zhang Lixian, folk singer Zhou Yunpeng and screenwriter Shi Hang.

The film is based on the true story of a Beijing plainclothes policeman named Zhang Huiling, who has been working for more than 10 years in Shuangyushu, a community of Haidian district, Beijing.

It depicts the stories of ordinary Chinese people struggling in the metropolis.

Zhang Lixian, who plays the lead role, demonstrates that he has a natural flair for acting.