Kim Eana (IU's lyricist), Park Yohan (IU's dancer) and Hanteo manager have đã bình luận on her bức ảnh (I'm way too lazy to scroll all the các bình luận looking for thêm people I know.)

She is also following several people, like Coordi Noh, that require approval to be followed.

IU's confirmed Instagram account: link

[UPDATE] IU's former producer, Cho Young Cheol, confirmed the account on his twitter via his Instagram: link and IU replied.

Translation here: link

bức ảnh caption translation:
ee ji geum (wordplay of ‘Lee Jieun’, meaning ‘this now’) Instagram. Why does everyone add # at the back?

trans source: link

bức ảnh source: link