The action comedy, directed by Ma Chucheng, is about two playboys-turned-policemen, one from Hong Kong and one from the Chinese mainland, who compete for the love of a girl, played by Hong Kong actress Linda Chung.

It's the first time for 31-year-old Aloys Chen to shoot a film in Hong Kong. He is also the first mainland actor to take a lead role in a Hong Kong film.

According to Yangcheng Evening news, Aloys Chen went through hard times during the one-and-a-half-month of shooting.

Ma Chucheng chose Alloys Chen in mid-April because he considered the way Chen concealed his pride under his calm appearance suitable for the role. But Chen was not very confident, as he had never taken roles in action movies before.

"I wanted to try something new," said Aloys Chen, who was confused about his future when his last movie called "The Door", was not successful and many people expected bigger breakthrough from him.

During the shooting, he had to learn Cantonese. "I felt very sorry every time when we had to shoot again because of my fault," said Aloys Chen, who would recite even his partners' lines in the past. But it did not work this time, as the director was prone to changing lines and adding new plots on the spot.

Aloys Chen also felt bad about hurting his Kungfu trainer's head on porcelain accidentally, hurting him badly.

Chen was a bit afraid at that time, confirmed Shawn Yue, who said that Chen's performance was not bad.

As for Yue, the report says he was very afraid of some of the weapons used in the movie, like electronic saws and glass bottles. As a productive actor with 30 movies in last five years, Yue said he never wanted to compete with other actors, like Chen Edison, popular Hong Kong star.