What movie are the two children and the monk old man playing?

What you are looking for is a movie starring Ashton Chen, Hao Shaowen and Ng Man Tat. Ashton Chen and Hao Shaowen collaborated on the following films:

1993 Shaolin Kid (also known as Cyclone Kid) Starring: Jimmy Lin, Hao Shaowen, Ashton Chen, Xu Haoying, Biddy Sheran, Zhang Zhenyue, Qin Pei, King-Tan Yuen and Li Mingyan.

1994 Shaolin Erluan Temple (also known as Shaolin Erluan Temple) Starring: Hao Shaowen, Ashton Chen, Ng Man Tat, Adam Cheng, Dicky Cheung, Yang Ziqiong, Ye Quanzhen, Li Ming and Lin Xiaolou.

1994 dragon starring: Ashton Chen, Hao Shaowen, Takeshi Kaneshiro, Ng Man Tat, Xu Jinjiang and Ye Quanzhen.

1995 "Invincible Stars" starring:, Dan Liwen,, Liu Shun,, Li Mingyuan, Ye Quanzhen.

1995 Shaolin Dragon Starring: Hao Shaowen, Luo Jiaying, Ashton Chen, Yuan Biao, Bidai Syulan and Kara Wai.

1995 "Ten Brothers" starring: Zhong Zhentao, Sharla Cheung, Ashton Chen and Hao Shaowen.

1995 "Gambling Saint 2 Street Gambling Saint" Starring: Ashton Chen, Lin Guobin, Ng Man Tat, Peng Dan, Chen Baixiang, Cheng Dong, Eric Kot, Fui-On Shing, William Tun, Wenjun Chingmy Yau, Donnie Yen, Yuan Kui, Li Zhaoji, Huang Xiong and Cai Yexin.

1996 "Adventures of Golden Island" starring:,,,,, Liu.

1997 "Grand Theft Auto" (also known as "Benevolence and Loyalty" and "The True Story of Grand Theft Auto") Starring: Jimmy Lin, Luo Shifeng and Ashton Chen.

1997 "Eternal Dragon Slayer" (also known as Nezha vs Monkey King) Starring: Jimmy Lin, Ashton Chen and Hao Shaowen.