Okay so far I have a few assumptions
1. The prosecutor's brother was killed two years ago which is also when the drugs started circulating. My guess is that drug dealer Kim drugged a homeless person and he accidentally kills someone with the drugs effect 🤔2. After that he dies from the side effects of the drug and the drug dealer puts him in the car and make it look like a suicide and maybe that's why ideun says there's more to his brothers death than he knows Of course I could be wrong
3. Anyway ideun somehow knows this. maybe he liked Mr gu so much he also stalked his brother 😂
4 After this maybe ideun investigate the brother's death on his own and after 2 years maybe he finally got evidence against him (the photo and maybe more ) and he went to confront kim which is maybe why he says he went to see him for Mr Gu
5. He meets Kim and throws the evidence in his face and tells him to turn himself in. They start arguing and in the heat of the moment ideun kills him or he takes revenge for the love of his life or he didn't and someone else did. Maybe the detective was the murderer all this time (twisttt)
I guess we'll know in the coming chapters
