Overbearing Immortal Doctor - Chapter 17 How to Prove

The heavens and earth change when the blood phoenix descends.

In a world transformed by dungeon gates and awakened classes, Hunters fight monsters to earn power, fame, and fortune.Frank? He awakened as a Trader. F-Rank.No spells. No sword skills. Just one system window… and 500 dimensional tokens.Everyone laughed. Told him to quit. But Frank didn’t need fireballs—he had something better:『Dimensional Trading System Online』Connects to other worlds. One trade per day. Limited inventory. Unlimited potential.He sold candy to bug warriors. Swapped solar chargers for alchemy potions. Bought a sword technique with instant delivery.Then, he opened a booth beside a dungeon gate… and started outselling real vendors.Now, the same Hunters who mocked him line up to buy.Guild-backed merchants want him gone.And Frank? He’s just getting started.He’s not hiding. He’s not cheating.He’s building a business—and a blade arm to match.When monsters strike, Frank fights beside his customers.When dungeon loot drops, he flips it across worlds.From a broke rookie to a cross-realm powerhouse, Frank isn’t just surviving—he’s becoming the most dangerous F-Rank in the business.

“What’s my class?”[Beast Tamer – Class E]“..Seriously?”Lee Min-Jae was a workaholic with no social life who died slumped over his keyboard. When he opened his eyes, he was in an RPG-like world — but with the worst class imaginable: Tamer.Tamers were seen as useless. Weak. Limited to disloyal, expensive-to-keep wild monsters.But he wasn’t just any fool. He was a systems-obsessed gamer, an expert at finding exploits and shortcuts.With his cold, analytical mind, he chose to break the game’s rules — by leveraging the most reviled mechanic of all: contracts.Where others saw abomination, he saw an exploit. And he was ready to turn the worst class into something unbeatable.---------------This story have:[Adventure][Smut][MSmut] (no NTR).[Harem][System / LitRPG][Strategy] - cold planning, exploiting mechanics, creative use of abilities.[Cold and Calculating Protagonist] – no naive romance.[Worldbuildin] – rules, politics, economy.[No NTR] – the protagonist is not betrayed, no passive humiliation content.

Like every (Isekai) protagonist, I got reincarnated after getting hit by a hyper-speed truck.

That was an empty and dark life anyway, so I was already looking forward to a decent, unknown afterlife.

But... the world had a unique thing in mind.

In this new world, I had parents, amazing ones at that.

My father was a talented mage, and my lovely mother was a sharp and cunning merchant.

Ignoring all of my weirdness, they loved me unconditionally.

This was the life that anyone would love.

Eating and cooking delicious food, practicing archery and magic, and playing with my parents.

Everything was wonderful until... those demons separated us and it left me in a ferocious forbidden forest, just to be eaten alive by beasts.

But dying wasn't even a question.

I will go back… to them.