Parents illegally stayed in South Korea. Haven't returned to China yet. Can I go again?

You have a bad record file in the Immigration Bureau for your friend to stay abroad illegally and be sent back to China. They will punish you for entering the country within a limited time. It doesn't mean that you are prohibited from entering the country unless you are blacklisted by the immigration bureau. The punishment period varies from country to country. I know that European countries illegally detain you for one year, punish you for not entering the country, and so on. Now that your visa has been issued, it proves that your restricted entry time has been eliminated. There's no need to worry. Speaking of blacklists, it is ok to set up people who are harmful to the country, terrorists, criminal cases and unwelcome people. There is another way to dispel your worries and avoid unnecessary losses, that is, to find your friends and acquaintances to check whether your deadline has been eliminated and just report your passport number and name. As far as I know, you have no problem entering the country in this situation. I hope my advice can help you. Good luck.