You can safely disable Mobile Services Manager (if your phone lets you). It's a USCC app that they use to collect usage metrics and even can use to send apps and ads to your phone.
Considering this, what is hancom app?
Hancom Office consists of Hanword (a.k.a. Hangul, hwp), Hancell (Spreadsheet), and Hanshow (Presentation program). Hanword, (also known as Hangul, Hangul Word Processor, or HWP) is a word processing application. However, users can save files in MS office formats, such as doc, xocx, ppt, pptx, xls, and xlsx.
What is the Knox app on Android?
Samsung Knox is a leading mobile security solution that provides a secure environment for corporate data and apps for all Galaxy devices. It protects your business and personal privacy from one device without the need for third party IT protection.
What is Android Incallui used for?
IncallUI is the system app that manages various onscreen functions while you're in a call. Settings->Apps Menu -> System UI. You cannot disable this as this comes with the device. But other applications might interfaces/interfere with this UI so you may see this in android phones.