Previously, Heize produced a song for The Heal―Wanna One's Ong Seong Wu and Lee Dae Hwi―called 'Sandglass'.
As Wanna One is a project group which is expected to be disbanded at the end of this year, Heize expressed the sorrowful hearts of the Wanna One members as well as their fans through the song.
Then on June 1 during Wanna One's world tour 'ONE: THE WORLD' in Seoul, Heize sang the part that speaks on behalf of Wanna One's fans.
Heize was seen crying during rehearsals, and she also showed her teary eyes when the fans at the venue sang her part along with her.
After the concert, a photo of Heize during the performance went viral on various online communities as her earring has a hidden message to fans.
In the photo, Heize is wearing a earring with a clock, and the clock is stopped at 8:07.
Along with the earring, Heize also posted a photo of a sandglass and another clock on her social media account, and the clock also displays 8:07.
The time signifies the date of Wanna One's debut, August 7, and it was her way to express her love and support for the members as well as the fans.
(Credit= Mnet 'Wanna One Go: X-CON', 'heizeheize' Instagram, SWING Entertainment, Online Community)