Doubleyolkeggs

John gets a second chance at life, going back to the time before "The Gate to Another World" appeared. Betrayed in his past life as a pharmacist, he decides he can't trust anyone anymore. So, he opts for a hidden profession, becoming a poison master disguised as a regular pharmacist to everyone else.
To the other awakened ones, John is just your run-of-the-mill potion maker. 
Little do they know, every healing potion he brews is laced with deadly poison.
"John, heal me quick... Fuck! John, what did you do to me? Why have I turned bald?"
"John!!Why did my penis turn into a mushroom after drinking your potion?"
"You guys dare to drink John's healing potions? I saw with my own eyes last time, he threw a bottle of his healing potion and it directly stank a Corrupt Lord to death!"
"And that's nothing! I saw a toxic serpent bite John, and guess what? The serpent got poisoned to death by him!"
John sneered at the collapsed crowd, "I've said it before, though my potions are free, they come with some minor side effects. Want to get rid of the side effects? That'll cost extra!"
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Supreme therapist：My healing potions can even poison the gods

Jill, brimming with a vinegar-like tone, interrupted, "Miss Eartha, I am the Lord Plague Doctor's agent. Signing autographs doesn't seem to fall within the scope of this operation, so please allow us to decline."

Eartha, covering her face as she chuckled softly, said, "Huh, are we being that strict? How about a photo together then?"

John, smiling, gestured dismissively, "Let's skip the formalities and get down to business."

"Alright, alright." Eartha brought the two of them to the sofa, and then she sat opposite them, reaching out to open the projection on the wall.

The data related to the remaining four other world portals in the Moonlight City appeared on the screen.

Eartha began to explain, "The most troublesome other world portal in the Moonlight City now is just this B-grade dungeon of the dead. I would still prefer to hand over the other portals to our guild members."

The Unkillable Beast