i think Jihwa
It's Jihwa who said that because Na Kyeum mouth has gag.
It was Nakyum. His mouth gag was dislodged and he was coughing 1 or 2 panels before.
I don't think it's nakyum because nakyum can't still speak before that and i think it was jihwa since he still hoping that nakyum didn't have sex with SH but then he saw the marks on NK neck
Yes, it was definitely Jihwa.
Oh you guys are right. Jihwa's speech baloon is round shape. Nakyum's is irregular because he's gagged.
A question from the new chapter
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When Jihwa went to check NK for evidence of sex, did he say "please"? Or NK was the one who said that?