“But…from before…it hurts a lot…Can we take it slow?” (casual speech)
Reading it in Korean, I can hear the change in his voice. Like, the first panel is normal nervous Bum voice and the second panel is soft, breathy (but still nervous) sex voice.
Reading the English version, I thought Sangwoo was simply repeating Bum’s words back to him, possibly to make fun of him for being such a pervert. But he’s not. What he’s saying here is slightly different than what Bum said. It’s more like he’s saying, “Sure, we can take it slow,” in reference to doing…whatever it is they’re about to do to Jieun’s corpse.