Today, f(x) Krystal graduated from Hanrim Arts High School.

According to her agency SM Entertainment, Krystal said, "It doesn't feel like I'm already 20."

She also said, "I'm a bit sad that I graduated and that I'm already done being a teenager, but I'm also excited. I'll see this as a new beginning for me and try harder."

Internet users who saw this commented, "People who went to school with her are so lucky," "She looks pretty in school uniform too."

Photo Credit: Sports Seoul