Korean font discrepancy
The short version is that you need to upgrade your tablet to a newer version of Android.

The long version is that the font rendering changed in Android, upgrading text from "unusual, like handwriting" to "simple and readable". At the beginning of 2013, Adobe donated their CCF rasterizer to FreeType (the font rendering library used in Android and Linux in general), which integrated the changes for version 2.5. It wasn't until the end of 2014 that the updated FreeType library was merged into Android's repository, so the earliest version of Android to get the update is 5 (Lollipop).

The Nexus line of devices generally gets Android updates really quickly. Other Android devices often lag behind by several months or just have support quietly dropped. If your tablet still has the problem and doesn't have any updates available, then switching to a third-party version of Android (e.g., CyanogenMod or Replicant) is probably your only option. Be aware that this could easily brick your tablet if everything isn't done perfectly, so you do it at your own risk.