He could be talking about his own attachment to Na Hae-Soo and his inevitable suffering, or he was talking about Na Hae-Soo’s attachment to Mincheol and her suffering. It’s very apparent that he’s been keeping tabs on Mincheol and Ari’s situation so he could be aware that she’s about to call Mincheol.
love thanks for the insight! after rereading it i agree with you - they’re all already attached to each other, the ml and mincheol are attached to na hae-soo, and na hae-soo and the girl mincheol slept with are attached to him, and according to our deep king - now all that’s left for them is suffering
idk what the ml was talking ab on the roof but i hope it was him yearning for the fl and vowing to break up that sham of a marriage