This 10,000 something or other* note show's King Sejong** who did something that the South Koreans still recognize him for: He invented their ALPHABET.
Now this is something to commemorate on your money. If the British were this sophisticated they'd have pictures of William Shakespeare on their money. American's would have to settle for Poe (scary money) or Twain (funny money?). Instead what do we get? Politicians. Washington: OK. Lincoln? I guess I can accept that. But some of these modern politicians they want to commemorate. No thank you. Let's consider Poe and Twain instead.
*The South Korean unit of currency is the Won.