October 23, IU made a post on her Instagram for the fourth anniversary of “Chat-Shire,” her mini album released in 2015, featuring a drawing from her late friend Sulli.

IU wrote, “My dear Chat-Shire, happy 4th anniversary.”

The drawing is one that Sulli had posted on her old Instagram, captioned “Portrait,” and later gave to IU. It became the motif for IU’s “Red Queen” and was featured in the “Chat-Shire” album. At the time of release, IU revealed that she saw the drawing at Sulli’s house and took a picture of it because it was a perfect match for lyrics that she had been thinking of.

Meanwhile, IU, who had been preparing for her comeback, wrote a letter to fans earlier this week regarding the postponement of her album release in the wake of Sulli’s passing.