'Yesterday') is a 2001 Chinese drama film directed by Zhang Yang, starring and based on the true life story of Jia Hongsheng.

Jia Hongsheng, graduated from the Central Academy of Drama in Beijing in 1989, gains fame in the late 80s and early 90s as an actor in films such as The Case of the Silver Snake and A Woman from North Shaanxi.

During rehearsal for a stage production of Kiss of the Spider Woman (also directed by Zhang Yang) in the fall of 1992, Jia first comes into contact with marijuana and subsequently becomes addicted and even experiments occasionally with heroin.

In 1995, after filming Weekend Lover, Jia quits acting completely and lives off his younger sister Wang Tong.

An avid fan of The Beatles, Jia listens to their music obsessively and begins to imagine himself as the son of John Lennon.

On 19 March 1996, after drinking many bottles of beer in celebration of his twenty-ninth birthday, Jia slaps his father, claiming to teach the latter the "meaning of life".

He called it a "brave experiment, based on life and using actors to play themselves, but it buys into the whole false notion that artists are too brilliant to be sober––that drugs and booze are almost necessary to tame their creativity, dull their pain, and allow them to tolerate life[...] Thus the 'cure' is not so much to stop using as it is to stop dreaming; one must become boring to become clean and sober.