Hero

Hero is is a manhua written and illustrated by Wang Yu Chen.

Plot
Oldman, a mysterious man who wears an old-man mask and punish the criminals and evils in the city, is the idol of many, including an elementary student named Tong. Even though Tong’s father is a policeman, he feels embarrassed and ashamed of his father’s inability to solve any crimes. However, on the day of Tong’s 12th birthday, something shocking happened…

Official

 * http://www.u17.com/comic/69027.html