
Haven’t read the novel but what I can think of which is which. The character Huimin do really have a disorder - the real Huimin is the frail one and he just created the “Huimin” who reads the Silence book to cope with the struggles in the real life. It’s like he’s acting the imaginary “Huimin” he created. And Inheon on the other hand may already knew that the Frail Huimin created an “Inheon” who went to America through those sketchbooks he asked to dispose so that Frail Huimin won’t be able to see it and realizing that the real world is the abusive world he lived in. Damn!! This hurts my head but it’s good.
I’m not sure if Jiheon was aware that the pills has those side effects. Then the architect professor seems colluded with the one who sold the pills to Jiheon. So ┑( ̄Д  ̄)┍
He doesn't. Because he specifically asked the shady guy if there were any side effect and he said "nope, none"