Who is the person on Heechul’s cellphone wallpaper?

On a recent broadcast of ‘100 Points out of 100‘, Super Junior’s Heechul was forced by F.T. Island’s Lee Hongki to reveal his cellphone wallpaper.
As it turns out, the mystery person in the wallpaper is Wonder Girls’ Sohee! Along with this revelation, the fact that Sohee being Heechul’s ideal type was brought up again, which made Heechul exhibit both an embarrassed and proud expression.
Hongki suggested, ‘Change your wallpaper quickly,’ to which Heechul responded, ‘I can change it to nothing else,’ further showing his unchanging affection for Sohee.
Soon, however, Heechul shyly added, ‘Fine. I’ll fix it,’ causing laughter in the studio.

Source: Newsen via Nate