Girl group Mamamoo reportedly finished recording a soundtrack for tvN’s series “Guardian: The Lonely and Great God.”RBW Entertainment, home to the quartet, confirmed Wednesday that it will sing for the drama series.The name and genre of the soon-to-be-released song has yet to be determined. The song is expected to follow “Stay With Me” by Chanyeol of boy band EXO and singer Punch.“Guardian: The Lonely and Great God,” starring Gong Yoo and Kim Go-eun, is off to strong start, with 7.9 percent local viewership ratings, according to Nielsen Korea. By Son Ji-hyoung ()