In my time at Ajou University I chose not only computer science courses but also Korean Language 1. Every one or two weeks we had to study some vocabulary that usually consisted of a list of 20 to 30 Korean words. When I was still in high school studying French and German I often used a Dutch website to practise the vocabulary. However, when I wanted to use it again for Korean language, I noticed that you now had to register an account and that you had to pay for most of the features. I noticed the same on several other websites, which gave me the idea to just start my own type of website like this.