1. I found from some posts that the client use is SS4 file _Game_Client_Season4.rar from http://www.megaupload.com/?d=VW68JDSZ , then apply Mu1_1.06D_Patch.rar and Main.1.06.30[D+] - Cracked.rar respectively
2. You can see in commonserver.cfg that this muserver use KOR protocal, so any chines client is not needed.