On the February 17 broadcast of 'Unnies' Slam Dunk', Jang Jin Young appeared as the guest to help the members prepare for their girl group debut. During the consultation,�Kang Ye Won showed concerns for vocal cord nodules. In response, Jang Jin Young said, "I understand how you feel because I've suffered from vocal cord nodules too."

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He then revealed, "Red Velvet's Wendy worked excessively for debut and ended up debuting with vocal cord nodules."