Contact

Questions, bug reports, and ticker requests are all welcome

Hi, I’m 이정철 (Jeongcheol Lee), the person who built and runs 10-eok. I’m not a financial company or an advisory firm — I’m a developer and individual investor who built this tool because I was curious “what if I’d invested like this in the past?” and wanted to check it with real data.

If you have a question, found a bug, or want to request a new ticker, feel free to email me at the address below. I usually reply within a few business days.

Email: jclee7503@gmail.com

What’s helpful to include

• If a calculation looks off (it helps to include your exact inputs)
• A ticker you’d like added
• Incorrect information or typos in a guide article
• Feature suggestions

I’m not able to respond to requests for personal investment advice. 10-eok is an informational tool, not investment advice or a solicitation.