Wow really appreciate your help @hazimjauhari90, I finally managed to use this client with the updated kRO https://rathena.org/board/topic/106413-kro-full-client-2017-04-11-includes-bgm-rsu/?page=3
There's still a couple of issues though:
- The texts are in Korean instead of English. I've read from other post that I had to hex the msgstring in NEMO but I'm not sure where to begin with
- The initial map that the player is warp to is still having blank/black scene
- Resources sprite error for some newer items, e.g. balloons