S.O.U.L. (Sound of Ultra Light) is a fictional group created for the Youtube Red drama "Top Management." The members consist of Astro's Eunwoo, actor Ahn Hyo Seop, rookie Jeong Yuan, and High School Rapper contestant Bang Jae Min (A.Mond). The drama is based on a web novel and is the first Korean drama produced exclusively for Youtube.
Source: 1theK, Soompi, kstarlive, mydramalist
For a drama song from a fake group, this is a jam