B1A4's Sandeul and actor Ahn Sae Ah joined forces to compete on the July 22 installment of 'Immortal Song'.
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Sandeul and Ahn Sae Ah, who became friends after meeting through the musical 'All Shook Up' 3 years ago, collaborated on the 'Summer with Friends' special of the show. The two were the last performers up with their cover of Lim Jae Bum's 1997 hit "Emergency".
Ahn Sae Ah expressed, "I'll enjoy the stage. Like our sunbaes, we'll make our 3-year friendship into 30 years. I've fulfilled my wish to sing with Sandeul and my dream to be a singer."