He wasn't immune to it tho lol
He's currently experiencing side-effects. Also, the best way to poison or condition someone is over time. If you do it all at once it's too obvious. It's why Song-hyeon or whatever was masking it as "medicine." If he fed it to Byeo-ru slowly over time then he'd think it was just him "falling in love" or whatever kind of drug he was being given.
I thought he was at least resistant to it since the creepy brother was acting like he was expecting a different reaction
Yeah, he might have some resistance, but he isn't immune to it.
That and I don't think his brother realizes that he *is* experiencing the effects he just isn't showing it around him. Byeo-ru is throwing up, experiencing numbness in his limbs and he was either running fevers or some sort of arousal out of nowhere.
We don't know what exactly he was being fed, but it is messing with Byeo-ru slowly but surely.
Gotta love the fucking magic, literally
Well at least they're finally together again, I hope all the people that try and catch the "yellow creature" fucking dies. What made the whole shitty excuse of a separation arc even worse is the mc's creepy ass brother, bet he had the hand in killing his family, especially the dad. The mum and mc got flowers when he thought they were dead but not the dad, I wonder who else can make similar medicine hhhmmmm (it was defo creepy brother)
Also love that the mc got fucked so much by the dragon that he's basically immune to poisoning or getting drugged cuz his bro was definitely spiking his medication