the speech bubble is basically just groaning or mumbling. it translates to hmm, nnn, and ugh. In this case ugh and nnn make the most sense, and the squiggly line just means that the character( aka nnn/ugh) is drawn out. give me my gold star please! 
straight cis guy that likes BL
Top 5 BL
1.Walk on water
2.Love so pure (def the side story)
3.Bongchon bride
4.Taming the tiger
5.Go out with me please
Top 5 BL
1.Walk on water
2.Love so pure (def the side story)
3.Bongchon bride
4.Taming the tiger
5.Go out with me please