Despite being bullied for six years, Li did not report to the authorities. Although Li might be afraid of the trio, I think that he should report this incident to the authorities as fast as possible to avoid them to bully Li. Not reporting this incident gives way to the trio to continuously bully Li.
Nevertheless, the trio has been caught. I think that necessary punishment should be carried out to prevent the trio to commit thus offence again when they are released.
The tattoo that had been tattooed on his body will leave a mark forever. Li should try his best to remove them. People that are hiring Li should understand that Li also doesn't want the tattoo to be there either. People should not take this as a offense and should treat it as a body art instead. Wearing long sleeves and pants might be a good way to cover up these tattoos.
The trauma that Li suffered was unbearable. No one should allow oneself to undergo this kind of bully. It is one incident that people will remember for life. If Li was to report to this incident earlier, maybe there will not be more victims like Li.