Prologue | To the Thirty-Year-Old Who Thinks Too Much

Chapter 1
When I feel anxious because I feel like I'm the only one falling behind
: How to protect myself from negative thoughts

When you have a lot to do but don't want to do anything
I wasn't the only one having a hard time.
Don't be scared! I'm not dying.
If you want to have strong, unwavering self-esteem - the art of organizing your mind
If you want to feel good every day - 3 exercises to build mental strength
How to protect myself from stressful people
What I Want to Say to Working Moms 1
Two Things I Want to Say to Working Moms
7 Ways to Free Yourself from Negative Thoughts
Not wanting to fail means not wanting to try.
It takes courage to stop when you need to stop.
Nothing will change even if you cry

Chapter 2
If you only make plans but don't execute them,
: The Magic Spell That Changed My Life 'No, Not!'

Think briefly, act quickly
7 Ways to Overcome Your Fear of Failure
If you still don't know what to do
Why a hundred failures are better than one success
How I found what I wanted to do
Once you commit something, you have the power to fix it.
Opportunities always come when you are least prepared.
Why a prestigious American graduate school accepted me even though I didn't have an English score.
Thirty, the age when you can achieve as much success as you set your mind to.

Chapter 3
When I want to do better but feel like I'm not good enough
: Smart work skills learned while working with the world's greatest geniuses

What is the best skill every business needs?
How to Develop Intuition That's More Powerful Than Big Data
Dos and Don'ts to Become a Recognized Person
How to stand out from 3.3 million resumes
My answer to the question, "Have you ever hit a home run?"
Why I applied to develop a smartwatch at Samsung Electronics
Five culture shocks I experienced when I first joined Google.
How Google's Geniuses Work
Things I Check Frequently to Become a Good Leader
How to Discover New Talents as Taught by Ratatouille

Chapter 4
Things I'd like to say to a thirty-year-old who wants to live a life without regrets.
: It's okay if it's slow, I'll do it my way until the end

Don't force yourself to do things that don't suit you.
Write down just three lessons a day.
The goal is to finish the race, not to come in first place.
To be truly happy for someone's success
Putting people before numbers
Don't judge someone rashly
Don't be afraid, just go forward wherever your heart leads you.

Chapter 5
The study method that saved me from giving up on English
: Until I realized that there was something more important than English skills.

Why You Don't Have to Be Intimidated by Not Being Good at English
A special study method that helped me overcome my fear of English.
Super easy English study habits anyone can follow
English is ultimately about content and confidence.
The more you learn English, the more powerful our language becomes.

Chapter 6
What will I be doing in 5 years?
: Things to do from now on to live the life you want

The One-Side Chart That Changed My Life - The "Me Fact Table"
The principles of job tech are more important than financial technology.
Why I Supported Google and Amazon at the Same Time
My usual answer to the question, "Is graduate school necessary for employment?"
Why Companies Look for People with Good Attitudes More Than People Who Are Good at Their Jobs
Interview techniques that will captivate the interviewer's heart
The most important thing in a career - Do you have your own story?
Things to Consider When You Feel Like Nothing's Going Right
The surest way to create your own story - do anything consistently for a year.

Epilogue | If you keep walking without giving up, you'll eventually get there.
Appendix | Top 10 Questions Thirty-Year-Olds Ask

CJ, Samsung Electronics, Microsoft, Qualcomm, Motorola… … What she learned from working with the world's best talents for 25 years, from barely speaking a word of English to working at 10 global companies in Korea and the US, to becoming a senior designer at Google.

"For the 30-Year-Old Who Thinks Too Much" is a book written by an author who has worked with the world's best talents at 11 global companies in Korea and the United States for 25 years. It teaches 30-year-olds who are at a turning point in their lives and have too many thoughts due to anxiety and worry about the future how to work smart and how to live a life without regrets.

The author followed her husband, who had been accepted to an American graduate school, to the United States at the age of twenty-seven, without any preparation.
The only English I know is 'Excuse me', 'Thank you', and 'I'm sorry'.
Although his English proficiency was woefully inadequate for graduate school admission, he was accepted into the prestigious Illinois Institute of Technology School of Design, and after countless challenges and failures, he succeeded in landing a job at Microsoft, Motorola, and Qualcomm, companies that everyone would want to work for.

Her fearless challenge was based on the belief that 'once you commit, you will have the strength to recover.'
I applied to be a computer instructor with no different skills from my college students, and spent my days like a sheet of thin ice studying one day and teaching the next (my students gave me good reviews). When I was applying to graduate school, I went around to professors and appealed to them in my broken English, and I was accepted.

Always challenging new things with the spirit of 'no, not', she received global attention in 2013 when she led the design of Samsung Electronics' smartwatch.
She was selected as one of the '18 Global Female Leaders Leading the Wearable Industry' and '50 Wearable Game Changers', and received the 'IDEA Design Bronze Award', putting her in the spotlight for the first time in her 20-year career.
Building on this reputation, in 2018 he moved to the Search and Artificial Intelligence team, a core department at Google headquarters.

“There are not many things that require perfect preparation.
What we really need is not perfect preparation,
“It is the courage to stop hesitating and pull the trigger.”
What she learned from her worst slump since joining Google

After moving to Google's headquarters in Silicon Valley in 2018, I faced the biggest crisis of my career.
I suffered from the worst slump, feeling inferior and apathetic among the world's best talents.
He was plagued by the feeling that everything he had achieved so far had been purely by luck, and that his true nature would soon be revealed.
Moreover, everyone around him seemed far superior to him.
For nearly a year, I lost confidence and spent myself blaming myself for not being able to live up to people's expectations.

With the help of those around me, I managed to regain my confidence and sent an email to my entire team titled “A Frog in a Well.”
It was an article containing the honest thought that work ability or evaluation does not represent a person's worth.
The article quickly spread throughout the company, and numerous people came out as frogs themselves.
Even those who seemed smart and capable were secretly fighting hard against themselves.
This fact was a great comfort to her, and she adapted smoothly to Google and regained her original form enough to win the 'Designer of the Year' award in 2020.
This led to active communication with people through lectures and social media, sharing stories of failure and success over the past 25 years.

“We are better prepared than we think.
And there are fewer things that require perfect preparation than you might think.
“What we really need is not perfect preparation, but the courage to stop hesitating and pull the trigger.”
Her warm support and realistic advice were especially well-received by people in their thirties.
Having gone through a similar process myself, I desperately wanted to provide them with some support and comfort.


Thirty, the age when you can achieve as much success as you set your mind to.
From now on, I will not waver and will walk true to myself until the end!

How did this timid and fearful woman rise to become a leader at Google? From stepping into the spotlight for the first time in 20 years of working life to winning Google's "Designer of the Year" award after 24 years, she was driven by a single principle.
Thanks to this principle of 'Being myself until the end!', I was able to remain unshaken even when seeing people ahead of me, and that's how I got to where I am today.
So she speaks to thirty-somethings who are at a turning point in their lives and are overwhelmed with anxiety and worry about the future.
Thirty is an age where you can be as successful as you set your mind to.
So don't be shaken and walk true to yourself until the end.

What we really need is not perfect preparation, but the courage to stop hesitating and pull the trigger.
So, you have to throw the ball you have in your hand here and there and see how it returns.
That way, I can clearly see what I'm good at and what I'm not, and that becomes the foundation for success.
Even if I work hard today, it may seem like nothing will happen, but those days accumulate to become a year, then ten years, and that's what makes me who I am.
Some days it feels like I'm doomed, some days it feels like I've gone astray, some days I feel like giving up, but there's no one else who can protect me but me.

If I live my thirties like that, I will be able to meet my true self, who has become stronger, when I turn forty.
Her life, which began with her studying abroad in the United States without any preparation and without being able to speak a word of English, is proof of this.
This book will give you courage, comfort, and hope if you want to live your thirties without regrets.


Think briefly, act quickly
Things you need to know to create a self you won't regret in 5 years

What should I do when I feel anxious, like I'm the only one falling behind? What should I do when I'm making plans but procrastinating? What should I do when I want to improve but feel inadequate? Through countless lectures, the author has strived to offer practical advice to address the questions and concerns of thirty-somethings.
Among them, the book contains content that received a lot of attention, such as how to make yourself stand out among numerous resumes, why companies look for people with good attitudes rather than those who are good at their jobs, not forcing yourself to do things that are not your style, caring for people before numbers, how to protect yourself from people who stress you out, and the most reliable way to create your own story.
And, in the appendix, we included the top 10 questions most frequently asked by thirty-somethings during the lecture, such as “I wonder how to find a breakthrough in stressful work situations” and “I wonder what are the most common mistakes made and mistakes that should not be made in corporate life.”
For those in their thirties who dream of a confident and free life but find themselves berating themselves for just another day, this book will teach them how to move forward in their own way, even if it takes time.