At first, they will send u a letter. they listed when and where u were caught. u will be asked to 書面認罪 and pay HK$200 as penalty then no need to go to the court. if u dun 認罪, then u have to go to the court on the day and the place that they mentioned in the letter.
First time, the offender will be fine not more than $200-HKD, it is depends on the judge decision. But the 2nd time, the fine will be double and so on. So, don't try to break the laws of Hong Kong !