Girl group Rainbow member Ji Sook revealed a handwritten letter thanking fans.

Today on her twitter she wrote, "Thank you so much to everyone," along with a picture.

In the picture, she is holding up the peace sign and pouting her lips. She also wrote a handwritten letter that read, "Thank you to everyone who congratulated us for our 3 year anniversary. We will continue to work hard for our fans."

Her neat handwriting also gained much attention.

Internet users commented, "Congrats on 3 years" and "Such nice handwriting."

Rainbow debuted in 2009.