What is the South Korean Calendar 2017 application, how does it work?

According to the introduction of Agus Haryanto, South Korean Calendar 2017 is a Productivity app on the Android platform. There is currently a 1.7 version released on Oct 27, 2016, you can see the details below.

South Korea Calendar with public holidays 2017 - 2018
You can see this calendar like calendar on the wall with Fitur like
- change Image Calendar
- change the height of the image
- set start day of week (sunday or monday)
- add note with icon birthday, love,task, ring