[In letter: Hello! This is Rainbow's Ji Sook~ Maybe it's because spring is here but I'm in such a good mood~ Hehe. How about a picnic with friends and family that you love? Your body and mind will become warm like the spring~ Yes it will~ Make sure you don't get sick from the season change! I thank you always for your support and encouragements~ Heehee. Have a good day!"]

Rainbow Ji Sook's handwritten letter was revealed.

On April 18, Ji Sook posted on her twitter, "A fresh spring mail from Ssok is here~" along with a photo.

In the photo is a letter that Ji Sook handwrote in different colors, along with a photo of herself in a theme park making a cute pose. Ji Sook's handwritten letter full of decorations and cute handwriting is catching the eyes of viewers.

Internet users who saw this commented, "Her handwriting is so cool," and "Ji Sook is so cute.”