Gao Gang, the owner of Qingsao Laofotang noodle restaurant in Taikang County, owes money and doesn't pay it back. Is there a professional lawyer who can sue for money back?

You should collect and keep real evidence, such as debts owed, repayment agreements, loan contracts, bank transfer receipts, etc. If repeated reminders fail, a lawsuit should be brought to the court within two years of the statutory limitation of action. Once more than two years have passed, the court may not support your claim.