Wendy has caught her sleeping with her legs fully split and her upper-body laid against the floor while covering herself with a blanket. Even though Wendy is scared of it, Irene can sleep comfortable in that position.
They both were guests together on MBC Quiz to Change the World in 2014.
They both were guests together on KBS Hello Counsellor in 2016.
When they went Thailand, for the Level Up Project!, they shared a room together.
On December 8, 2017, on Red Velvet's official Instagram account, they uploaded a video of them dancing to "Black Suit" by Super Junior.