I like seeing Song Hangyeom (the one in purple) dance. He is explosive when he does the snappy parts.
They covered 거짓말 by BIGBANG(빅뱅), Again & Again by 2PM, and Shock by HIGHLIGHT(하이라이트) in the first video.
They covered BTD by Infinite (인피니트), 으르렁 by EXO, and DNA by BTS (방탄소년단) in the second video.