Reasons to celebrate is IU's 2000th day since her debut. There has been so much accomplishments during over her career so far and positive feedbacks from her fans. 

IU shared on her official Facebook account on 10th, "Congratulations on 2000th day anniversary since debut♥ Now she is solving the exam '#IU Section' from U-AE-NA! It somehow became the 2000th day since her debut♥♥ Singer IU is sincerely solving the exam questions that U-AE-NA set for 'IU Section'. Thank you, U-AE-NA who consistently loved [IU] during those 2,000 days!"

Although its been a while since her graduation, IU still proves to her fans that she's willing to take a test, putting forth genuine efforts to solve even her fan-made questions.

Congratulation to IU!