 Complete the following phrase:  In the 80s, also two female singers, Kim Soo-hee and Sim Soo-bong enlivened the sinking popularity of trot music. The two began their music career in the US Army club: Kim sang as a vocalist of a band Black Cats and Sim worked as a drummer of a band Nonstop. They are both singers and songwriters. Sim Soo-bong debuted in College Song Festival in 1978 with The Man Back Then . It was very rare for a singer to participate in the college festival with a trot song. Although she got no prize, the song became a big hit the next year. Like the success of Come Back To Busan Harbor, so also the hit peaking of The Man Back Then probably has to do with the political incident back then. The song as well as its singer drew special attention to themselves because Sim was present at the 