Extending your Tourist Visa in South Korea

As many of you know, i am not an Englisch Teacher and spending my time here in South Korea with a Tourist Visa. I tried many things, but there is literally no way of extending your visa here. The only way to extend your tourist visa is simply by leaving the country. So i decided to go Fukuoka in Japan today and you wont believe how many other people are doing the same. Everyone at the Fukuoka Airport is well aware of this phenomena and leaving you through without any big questions. I went there in the morning and planed to go back in the evening. But one fella told me, that there is a flight going back immediately.. but i really needed to go through all the passport / security gates to the ticket window and going back through everything again. Checking out and being back on the plan took me 20 Minutes.. i was really running all the time.. and i made it :D Korea - Japan and back in 3 hours.. 

So now i have three months again.. pretty crazy, isnt it? So if you plan to extend your tourist visa in Korea, just go to Fukuoka.. of course, it wasnt cheap, but this is really the only way to extend your time here in Korea. If you have some better tips, feel free to share :)