사랑해 (saranghae - I love you) is obviously in hundreds of K-Pop songs, so this video is about 첫사랑 (Cheot Sarang, meaning First Love).
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There are 34 songs in this video - as always there are more than one T-ara songs and also Seventeen’s Very Nice is competing against Girls’ Generation’s Gee for the song with the most features in this kind of videos :D
f(x) - Rum Pum Pum Pum
T-ara - Like The Fi