'Produce 101's Hwang In Sun, who made her solo debut recently, and HISTORY appeared on SBS powerFM's 'Kim Chang Ryul's Old School' on April 28.

In the opening part of the show, Hwang In Sun revealed, "Honestly, I did dance for a long time."  She gestured at HISTORY's Song Kyung Il, who was sitting in front of her, and said, "We know each other.  We did dancing together," surprising everybody.  Even his fellow members said, "This is our first time hearing of this."

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Hwang In Sun said, "We learned from the same dance instructor," and he confirmed with, "That's right.  I also did modern dance."

In addition, she was asked how much she could drink, and answered, "I can drink about a bottle or two of soju," but Song Kyung Il said, "I feel like you're saying less than you can actually drink.  I think you drink four bottles at the least," making everyone laugh.