Jang Gyuri's mistake during her group battle performance may have been the deciding factor to her group's defeat.

On the July 6 broadcast of Mnet's 'Produce 48', the group battle evaluation between Group 1 and Group 2 took place, with both groups performing 'Peek-A-Boo' by Red Velvet. During practices, Jang Gyuri, who was the main vocalist of Group 1, began to develop inconsistencies in her voice. Eventually, in Group 1's performance, Jang Gyuri had a voice crack in the high-pitched portion of the song.

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On the other hand, the main vocal of Group 2, Hong Yeji, had a charismatic performance that received great praise and applause from the crowd. She received 92 votes from the crowd compared to Jang Gyuri's 78. Jang Gyuri later apologized to her teammates, saying, "My mistake not only hurts me but it hurts my teammates as well. I am so sorry about that."

Against all odds, Group 2 took the victory against the "Avengers" Group 1, and each Group 2 member received 1000 extra "benefit votes".