Hi, I'm Hajin.

I'm a software developer, a former professional Go player, and an MBA.

Go is the most complex strategic board game humanity ever invented, and I am proud to be a master Go player. I was a professional Go player in South Korea for over 10 years, and now I enjoy this amazing game as my favorite activity.

I live in Mountain View, California, with my awesome husband. We love to help each other in Go and programming. We are both beginners in tennis, but we have a ton of fun nonetheless, playing it together once a week.

Contact me!

My Mission


Strive to be wiser each day. Learn from experience, conversations, books, and contemplation.


Listen more than speak, and carefully communicate what I know, think, or feel. Avoid assuming other people can read my mind.


Love is a verb, not a feeling. Love my family, friends, and myself.


Always have a strategy based on long-term perspectives, even though it requires frequent revision.

Personal Projects


My YouTube channel began as an experiment. I made a few videos where I talked in English about my plans and strategy while I played Go online. These few videos went viral in the Go community, and I continued to make various Go videos since then. Today, my channel has over 200 videos, 12k subscribers, and 20M minutes watched.

Open the Channel


My first published book, Outside the Board, is a collection of 70+ blog entries I wrote during my transition from an active professional Go player to an undergrad student to a young professional in business administration. Recently, I began to work on another book on my childhood years as a Go prodigy.

Check Out the Book