The single 'Why So Lonely' contains titular "Why So Lonely", "To the Beautiful You", and "Sweet & Easy". "Why So Lonely" is a reggae pop composed by Sunmi, Lim, and Hong Ji Sang. The lyrics were written by Yubin, Sunmi, and Lim. Likewise, "To the Beautiful You" was composed and written by Sunmi, Yubin, and Lim, and "Sweet & Easy" was composed by Yubin, Yenny, and Hong Ji Sang, with lyrics by Yenny and Yubin.
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