Ch 19

Lmao. It's a funnel, so they could pour it out without spilling, or mix in something else without spilling.

And that would only make sense if it was cocaine, which it definitely isn't. Powder heroin needs to be mixed with water and measured carefully, which is why it's always poured directly into the needle cap. It doesn't make sense to pour all of it out onto a surface if you're doing it intravenously. And they're the ones doing it, so it doesn't make sense for them to cut it with anything. So, until it's stated otherwise (and maybe it is, I'm not that far into it) I'm going to assume it's a heroin like drug that's specific to this world.

1. It's specifically stated that it's a leftover and in the novel they say they mixed it with water. 2. It's more likely meth or a designer drug based on the effects we see later.

I didn't read the novel (didn't even know there was one), so I'm just going by what's presented in the manhwa. It's definitely not meth. Meth is an upper. Based on the dopey looks on their faces, the lying on the floor, the drooling, and some of the imagery, they definitely took an opiate-like downer.

Unfortunately Korea's general understanding of drugs is pretty poor. Again, when they fuck for days in one episode... that's an upper. The dazed look and hallucinations, sure, that's more like an opiate downer. Unfortunately what it "actually" is is probably just some Korean writer's idea of a drug that doesn't even actually exist. That being said, meth is the drug other than weed that koreans are probably more familiar with.

The one where they were fucking for days was a different drug than the one he took when his mom died. The one he took the first time was an opiate like drug. The second time... I'm going with an in universe version of mdma.

"what it "actually" is is probably just some Korean writer's idea of a drug that doesn't even actually exist." - exactly, so it's an in universe thing.