Rainbow's Jisook was the 1st idol to fill in as Leeteuk's intern on 'Strong Heart'.

'Strong Heart' had revealed that they will be trying out various interns for Leeteuk's vacant spot, and announced that almost 40 idols were vying for the seat. Out of all the hopefuls, Jisook was the first idol to take the stage next to Eunhyuk.

Jisook first appeared on stage in a suitcase rolled out by Eunhyuk. The panel shared their doubts that she was in the bag, saying, "There's no way a person could be in that bag", but Jisook popped out cutely from the bag, surprising everyone. Jisook introduced herself and said, "Hello, I'm Rainbow's Jissok. I'm going to learn a lot from Eunhyuk sunbaenim to get this seat."

It was revealed that Jisook also had used the same bag scenario during her audition, and also won over judges Boom and Park Kyung Lim by imitating a sick chicken.

Do you think Jisook has what it takes to take Leeteuk's spot?