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Changsub is joined by Key (from SHINee) as he reviews Seoul National University's Broadcasting Club during winter vacation.

Changsub is joined by Key (from SHINee) as he reviews Seoul National University's Broadcasting Club during winter vacation.

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It's the start of the first semester and Jeongwaja returns to change majors again! Lee Changsub goes to the Department of Business Administration, the largest number of departments in Korea. From marketing classes, which are the foundation of business administration, to how to be flattered at work?

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To go to the same school as Yim Siwan, Jeongwaja commutes for 10 hours! Lee Changsub learns Mechanical Engineering with a special lecture on real Busan dialect from the local and fundamentals of machine that is easily(?) learned with Legos and robots.

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Lee Changsub takes physics class, which is known to be a class that only real fans of science take!

Starting with Interstellar's quantum mechanics

and even an experiment that can win the Nobel Prize(?), Ant-Man, Doctor Strange...is it possible in real life?

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From shampooing to drying and cutting,

Lee Changsub goes to the Division of Beauty Art and experiences a full course at a hair salon by majoring in Hair Design!

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Lee Changsub takes a class in the Department of Architecture that says staying up all night is basic! Taking a class at a construction site blowing cement powder and a design class where the professor buys chicken, Jeongwaja finally finds his talent?

From storytelling to nonverbal communication method, Lee Changsub learns everything by visiting Media Communication, a popular liberal arts department! With a surprise appearance of colleagues at work, Jeongwaja goes back to his main job?

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Lee Changsub goes to the Department of Companion Animal Health where he took classes with Shiba (not swearing)!

From making pet food that even people covet to pet training tips that surpass Kang Hyung-wook, how will Jeongwaja (aka Guri's daddy)'s adaptation period to the Department of Companion Animal Health be?

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From the mystery of the birth of life to urgent real emergency room case practice, Lee Changsub learns in Ajou University's Department of Nursing! How does one respond to an emergency room patient? Jeongwaja shows us how!

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Jeongwaja goes to Hansung University's Department of Fashion Design to become a fashion leader of the new generation!

Lee Changsub tries to make clothes himself and even does the fitting! Let's check his fashion sense!

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Lee Changsub goes to the Department of Hotel Culinary Arts and tastes heavenly food!

A Jeongwaja who receives a special secret from Professor Lee Yeon-bok and Professor Jung Ho-young is reborn as a Cooking Master Boy, in one day?

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"Jeongwaja has been ordered to be re-enlisted..!🪖”

Jeongwaja ended up re-enlisting in the army to carry out the promise he made for reaching the 🔥500k subscribers🔥 milestone

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Pukyung National University Marine Sports Department

Gachon University Dental Hygiene Department

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Woosong University’s Railway Logistics College

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The long-awaited first episode of JeonKAIja is all about… Chemistry! 🧪🧑‍🔬

From wild science experiments that scream “mad scientist” to the first-ever department room raid in Jeongwaja history! With high hopes, JeongKAIja heads to the very first campus! But… did he actually understand the KAIST lecture? 🤔

"Hey, you feeling confident?"

We visited the Martial Arts Department at Yongin University! From real sparring with a boxing athlete to intense ssireum matches with muscular opponents!

In the end, KAI got knocked out… And after just two shoots, did KAI grab the PD by the collar?! 👊

How are you? I'm fine thank you. And you? Went to Sogang University Department of English Literature! Do English Literature majors learn this too?! From analyzing Harry Potter to free-talking with a native English speaker!

Salute!🫡

JeonKAIja, reporting for duty at ROTC! From physical training with ROTC cadets to an impromptu meeting with ZE:A Dong Jun!

KAI, the second major changer, visited Jeju University’s Department of Aquatic Life Medicine.

Thanks to the Department of Aquatic Life Medicine who allows us to have No. 1 snacks for alcohol, olive flounder. Nation’s first variety show to fish dissection and local’s pro tips on Jeju!

There's a university in Seoul that even Jeongwaja's never visited yet?

We went to Sangmyung University Food and Nutrition Department! From a surprisingly delicious toast recipe to anti-aging tips directly from a professor!

Jeongwaja returns with a second special episode! This time, he visits the student council! 💫

The highlight of student council work? The university festival! KAI takes on the mission of inviting aespa himself! Will he succeed...?

By chance, in my childhood~🎶

Visited the Voice Acting Dept. Korean Broadcasting Art School! From top-tier anime dubbing like Teenieping to meeting the legendary voice actors behind Conan and Luffy! Live reveal of the voices from your childhood✨

Jeongwaja, let's go to school! This time we went to Hanyang University's College of Education!

From a 8th grade class demonstration to making your own textbook! A trip down memory lane.

Jeongwaja Finally Hits the Bread Scene 🥖

Today, we visited the Hotel Baking & Pastry Department at Korea Tourism College!

From one-of-a-kind artisan loaves made with a Master's top-tier recipe to a chocolate workshop bursting with sweetness 🍫

Bread-spoon KAI's hands-on baking adventure ✨

Pikachu! 1 million volts!

Today, we visited Yonsei's Department of Electrical and Electronic Engineering!

From buzzing beginner analog labs

to hidden electronic theories in real-life applications!

A thrilling engineering deep dive by JeonKAIja, the engineering student!

The language of our nation differs from that of China🤴🇰🇷

This time, we visited Korea University’s Department of Korean Language and Literature!

From classes that dig deep into phonology to emotionally rich lectures on modern poetry!

And so, KAI became a literary boy📚

Which major should we try today? Take a guess! For the first time ever, Jeongwaja visits the Division of Liberal Studies!

Today, everything’s free and flexible. The university is free, the major is free, even the classes are free?!

So, which department will our Jeongwaja end up in…?

The long-awaited ballet episode is here, Snackie! From a deep dive into ballet terminology to hands-on practice with the classic Swan Lake!

Will KAIja nail the ballet—or tear something else?

Jeongwaja back with summer break, part 1 at SNU Insect Club! 🦟

From spine-chilling insect mukbangs to full-on summer break vibes with bug catching!

And, to enjoy the break the special guest, TEN, is invited?!👀

This is the second lesson! Part Two of the summer break special, Senior University!

From anti-aging secrets and the low-intensity health dance to heartwarming creative writing classes! Plus, the perfect guest for Senior University: Lee Myeonghwa, RALRAL’s alter ego!