This game is based on a comic book/tv animation/ theater musical series which attempts to make learning Chinese characters (NOT the Chinese language ) fun for Korean children. While the Korean language does have its own unique writing system, much of Korean's etymology is based on Chinese (essentially borrowed words from the Chinese language).
Thus, knowledge of the Korean employment of Chinese characters would be akin to an English speaker having a solid knowledge of Latin and/or Greek.
Ultimately, knowledge of hanja is not essential in Korean society, but those who wish to understand the Korean language on a deeper, more sophisticated level can study hanja and take an exam to prove their knowledge.
This game's title is "Cheonjamun" (???) which means 1,000 Chinese letters (also the title of the "Thousand Character Classic" which you may have heard about in an Asian history course) In Korea, the lowest level test requires knowledge of 50 characters, and the higher levels go into the thousands of characters
An interesting feature of Korean hanja is that Korea preserves, it its entirety, the traditional Chinese characters. The only other nation to do this on a widespread scale is Taiwan. Mainland China executed a wholesale simplification of their writing system and Japan simplified only a selection of characters (in their Kanji system).
For example, the character for "hall" as in city hall, perhaps some other official hall is ?. The Chinese simplified version looks like this:?
As you can clearly see, the traditional version of the character uses I believe 25 strokes, while the simplified has 4. Of course there are varying opinions on the aesthetic
value of simplification as well as loss of internal meaning and etymology present in the traditional characters.
Anyways, the game should prove interesting if you are at all curious about learning Korean.