Why can't we hear IU sing 'Marshmallow' on stage anymore?

IU declared that she would not sing 'Marshmallow' after the 2018 IU concert....

For those who miss IU from her debut days, Marshmallow is a symbolic song ㅠㅠ

The reason is...?

IU said, "There are more and more songs to sing. It's also become difficult to sing cute songs when making a set list."

"I will sing 'Marshmallow' until I am 26 years old after this performance.

The cute stage has retired," he said.

Marshmallow, who has always been by IU's side, also shared his thoughts.

"It was a very happy 10 years," he said.

"After retirement, I plan to enjoy a leisurely old age while warming myself up with a cup of hot chocolate."

As a bonus, here's a photo of IU on stage during her Marshmello promotions~~