Visa Situation

[smileplur]

I need to extend my non-imm o based on marriage. I have found myself in a bit of a situation that I am looking for some clarity on. I have to get a visa for Korea. As such, I dropped off my passport this afternoon expecting to get it back tomorrow. They informed me that tomorrow is a Korean holiday. My current stamp says valid until 19 August. I can pick up my passport on Monday provided there are no delays at 10:30. At this time, I plan to go to immigration. However, the Korean system is a little screwed up for the type of visa I need. On another thread (http://www.thaivisa.com/forum/Visa-Options-t205055.html), I was told that I can extend my visa for 60 days for 1900 baht. This is what I intend to do on Monday, the 18th.

My question is that if something goes wrong, can I do a visa run on the 19th and not be on an overstay? I have never put it off until the day stamped in my passport. I have been trying to reach someone at immigration, but it doesn't seem to be going well.

[lopburi3]

You can leave on the 19th if need be. It is the visa entry date that must be made the day before.

[smileplur]

Ok, I just want to make sure I can do a visa run if things don't work out at immigration. I only need about 2 more weeks before I fly out to Korea.