Well, first of all welcome to the glorious frustration of Shaiya P.Server developing. Luckily for you there are bundles of useful bits of information all around here, which will guide you through pretty much any problems you'll come up against.
First Point: This could be one of a few separate issues, most of which you mentioned yourself. Make sure to
double triple check those points to make sure you're not simply missing something basic.
Your IP address should be inserted into the server .ini files, which as you are trying to connect locally i would assume to be something along the lines of 192.168.0.1
PSM_Client > Bin > Config > ps_game.ini
PSM_Server > Config > PSMServer_Config.ini
(<sv_publicip> = xxx.xxx.xxx.xxx)
Also it should be inserted into your clients Game.exe (that you run the game with) Most Game.exe versions you can find here come with the IP 127.0.0.1, which should allow you to connect locally without further changes.
Open Ports 30800 and 30810 in your firewall (game server / login server) Just incase that is the issue. Then finally check your logs (PSM_Client > Bin > Log) each of those will tell you what is failing to connect properly.
You are mostly likely to find the issue is being unable to connect to the database (usually through linked servers not existing, there is a post here to fix that issue if that's the problem)
Point 2 : About restoring your database tables, I'm not too sure why you are trying to do that, if it's just for self testing/messing around, you shouldn't have any "real" data that is needed to be backed up. You should be attaching each of the Database tables into a blank DB. (

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Finally Point 3: Are you sure your client is Korean, or are you just looking at a certain Sdata file that seems to have Korean text. (i believe it was the EP4 Item or Mob Sdata's that displayed in Korean) When you have your database attached, you can grab the translated (English) text from that, then import it into your Sdata through ShStudio (i'm not sure how this is done on the new 0.7.5 version as i haven't tried, but i would assume it to be in the file menu like the older versions of ShStudio had (import)) You can also find a 4.5 client version here, from Aries if i remember. Use the search or the releases section stickies to find it
Good luck, and if you can't find the fixes for yourself, post your log files here to give us a bit more info to help you better