A man who was a riot police officer during the May 18 pro-democracy movement, repenting after suffering from a sense of guilt, and avenging for those who were responsible during that time.A man who was a riot police officer during the May 18 pro-democracy movement, repenting after suffering from a sense of guilt, and avenging for those who were responsible during that time.A man who was a riot police officer during the May 18 pro-democracy movement, repenting after suffering from a sense of guilt, and avenging for those who were responsible during that time.