Ask for the name of a Hong Kong gangster TV series, and only remember a fragment.

What you should be talking about is Hong Kong opera.

Chasing the Past is a fashionable gangster drama produced by Chi-wah Lam, co-written by Zhu, and starring Zhu, Shi Xiu, Shang Tiane, Jiang Zhini and Deng Jianhong.

The play tells the story that two generations of father and son are connected in time and space because of an old telephone, and they jointly pursue the murderer in two time and space.