How to avoid getting sec-check because facebook is being an . Here are the tips to decrease the chances of getting security check.

1. Do not keep add everyone at once. Do it slowly. People will add you once you are announce in the bulletin board. 
2. Do not copy and paste your introductions. Make it different. eg: "This is byunghun. Nice meeting you" "Byung to the hun here" "Shortie byunghun here" "The most coolest guy ever, Byunghun"
3. Please try not to spam post. Facebook do not like spammers. 
4. Try to use a recycled account
5. Post in groups if you can. 
6. Be active. 
7. Play random facebook games with /coughs/ Byunghun
8. Put English as your first language not Korean
9. Do not put your city as "Seoul, Korea". Use other country. 
10. Turn on your secure browsing, add more emails, change your facebook url. 
11. Keep your wall active if possible
12. Pray