INFINITE's Hoya and Girl's Day

Idol Group Infinite's Hoya has became a new member of Girl's Day?
He was seen with Girl's Day members on KBS2 Music Bank dressing room interview.

Infinite's Hoya to greet with Girl's Day
"Hello everyone we're Girl's Day"
 
 
Hoya sings a new song of the Girl's Day together
 
 
▲Image Source: Online Community &
A capture of KBS2「Music Bank」