This multi-client method is very simple and only requires one file to be downloaded, Sandboxie.
You can find Sandboxie Here. Or go Straight to Sandboxie.com.
Once you have downloaded Sandboxie Install it and follow the simple steps below.
1.Right click your GrandChase Icon and go to "Send to" then "Sanboxie-Default Box". (This will cause grand Chase to start up automatically)
2.After Starting the Sandboxed Grand Chase client Wait for it to load to login
screen, then start your second client normally (without using sandboxie).
here is the video
add me in GCph akishiyo