Yes it's different he it's kinda spoiler roll at ur own risk --
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Its sleeping medicine since della wanna sneak out of here with fighting everyone while getting injured and even at point of get killed Keith made plan to make della completely dead for outside world so they both can especially della can get out of cell together but as always henry is always in the way
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My bad not sleeping medicine but medicine that stops heartbeat for a while makes someone dead he later give della antidote but yah della become dead for a while for check up. Purpose
If I remember correctly, the MC used the medicine given to him by the second ML to himself, right? I hope the one he has right now and the one he gave to Della is different. We can't have them both falling. We need the other to pull the other.