Can someone explain to me the specifics of their ability? (〜￣△￣)〜

taekyung (pink eyes): makes people experience hallucinations where whatever they imagine feels extremely realistic

siyeon (purple eyes): controls how cold his body is, body temperature of his targets. can "shoot" "coldness" towards his targets and make their internal organs freeze, or can do the same by touching them directly.

I get that part, but can they use their ability without drinking that pill?

Nope

Thank you for your answers. I had more questions but I will ask about it next time ヾ(❀╹◡╹)ﾉ~