On the March 22 episode of 'Happy Together 3', Highlight's Yoseob and Kikwang, Wanna One's Kang Daniel, Kim Jae Hwan, Hwang Min Hyun, Bae Jin Young, and more appeared as guests for the karaoke segment of the show. 

During the show, MC Kim Soo Yong pointed out the time that he tried comparing the size of his face with Highlight's Yoseob on a previous episode, then suggested that Yoseob try comparing his head size with Wanna One's Bae Jin Young next. 

The other guests and MCs commented, "Their heads are so small", "They don't have a face", and more, while Yoseob and Bae Jin Young stood side by side. Yoseob, who is very famous for having the smallest head of any celebrities, was shocked to meet someone with a head just as small! Yoseob exclaimed, "Wow, his [head] is super small!" 

MC Kim Yong Man said to Yoseob, "You used to not have anyone who could even compare, but now you have a rival."