Youngsuk Jang

# The privilege of the iOS and App Store Users!The best reading note application, "RLeaderoom"1. The smartest way to read a book!- Statistics, Book li …

Easy and fun brain training game!A wellness game that use mental arithmetic ability,agility, concentration, and a dynamic vision at a time!In your any …

Just touch and jump with your sense! that's it!However, it's not going to be easy!Why does the Rabbit cross the cloud?At the end of the jumping, what …