On December 13, five members of Red Velvet joined SBS LOVE FM's 'Kim Chang Yeol's Old School' as guests.
![Red Velvet](https://img.sbs.co.kr/newimg/news/20181214/201260824_700.jpg)
▶ [SBS Star] BLACKPINK JENNIE & Red Velvet IRENE's Dance Swap Goes Viral Online
![Red Velvet](https://img.sbs.co.kr/newimg/news/20181214/201260823_700.jpg)
She continued, "So I told her that I will also add her part into my free dancing part of our song 'RBB (Really Bad Boy)'. That's how we ended up switching the choreography."
![Red Velvet](https://img.sbs.co.kr/newimg/news/20181214/201260821_700.jpg)
jennie and irene giving each others' choreo a little shoutout (2018) @RVsmtown pic.twitter.com/Af1TgX5Vpl
— red velvet doing things (@rvdoingthings) 2018년 12월 8일
(Credit= SBS LOVE FM Kim Chang Yeol's Old School, SM Entertainment, YG Entertainment, 'rvdoingthings' Twitter)
(SBS Star)