The Concept Battle took place on this week's episode of 'Produce 101' season 2.
The remaining 35 trainees split into groups of 5 for the concept evaluation round. The songs available for the battle are Deep House - ''Never'', Hip Hop - ''Oh Little Girl'', Future EDM - ''Knock'', Synth Punk - ''I Know You Know'', and Nu Disco - ''Show Time''.
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The group that came in last with the least votes of 83 was ''I Know You Know'' team with Kim Tae Dong, Kwon Hyun Bin, Seo Sung Hyuk, Kim Ye Hyun, Kim Dong Hyun, Kim Dong Han, and Jang Moon Bok.