This device (even stock) uses a /data/media sdcard. As you said its emulated, and KT is not a separate partition. The entirety of /data space (around 10 or 25 GB depending on which model) is shared among /data for apps and sdcard, so moving to sdcard is not logical since it'd do nothing for you. If you have an insufficient storage method when installing apps and you have space, then its actually a different issue. Search for some possible fixes for this error. One involves deleting the app folder in /data/app-lib.