Exchanging my IQ for everything

Li Chuan, a transmigrator with hyperthymesia, can remember everything he has encountered since birth, including memories from his previous life.

This ability gives him a photographic memory and excellent grades, but his brain is running out of capacity, and he is at risk of becoming a vegetative patient.

Fortunately, Li Chuan transmigrates to a mysterious world connected to the Myriad Worlds. After passing the selection process, he enters the Realm of the Myriad Worlds and gains the ability to exchange his intelligence for anything. In time, he becomes the strongest person in the realm.

The drawback is that whenever he exchanges his intelligence, he occasionally turns into a three-year-old.

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[Ding! The Realm of the Myriad Worlds has detected that Li Chuan possesses extraordinary intelligence. Would you like to exchange the knowledge you've accumulated for medicine to treat your condition?]

Li Chuan: I have memories from my previous life and an adult's ability to think. My knowledge from this life can stop at age three. Treating my body is the priority.

[Ding! Memories from after the age of three have been exchanged.]

Li Chuan: I didn't ask you to exchange my memories from my previous life, too! Now I'm really three years old! Who am I? Where am I? Where are my mommy and daddy?!

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Shen Nianxiang, who lives in the central city of the human realm in the Realm of the Myriad Worlds, finds an unconscious young man and takes him home to care for him.

When the young man wakes up, he stares at him without blinking.

Shen Nianxiang hands him the meal he has prepared.

The young man looks at the bowl and says seriously, “You must be my dad, right? Dad, you're younger than I imagined.”

Shen Nianxiang: ...

Across the Myriad Worlds, I alone reign supreme!

A cheerful, overpowered bottom who occasionally loses his intelligence × a gentle, warmhearted top, the ideal partner for home and travel, a domestic goddess of a man

Theme: Knowledge is power! There's a treasure trove of wisdom in books.