I work across four areas. The details are unpacked in videos and papers, so here I've just laid out what's going on, at a glance.
As managing director at Daejeon Jungang Cheonggua Co., Ltd., I work with the settlement records and shipment patterns that pile up there every day. I run a pipeline that automatically collects and organizes eight years of settlement data.
On top of that, I'm building a conversational agricultural-intelligence platform (Wholesale Intelligence). It's about asking and answering — in plain language — questions on price patterns, shipment flows, and trends by item. The goal is to let the data answer the questions I run into on the floor every day.
My research is mostly about how to verify AI systems, with one more paper that looks at my day job — the wholesale market. The actual claims and methods are in each paper. How far can you trust what an AI returns, and how should you handle that — that's the part I find most interesting lately. On the AI-verification side there are four papers, with a unified one submitted to TACL and under review; the wholesale-market study is submitted to the Journal of Rural Studies and under review. Separately, two more papers are in preparation — one on AI evaluation methodology, and one on a medical application written together with a clinical expert.
I look for and report memory-safety bugs in open-source libraries. In 2026 I reported 15 CVEs, and for 4 of them I submitted PRs upstream that are under review. In May I filed my first MITRE cveform directly (Request 2041287, miniz). I'm waiting on the CVE IDs.
I run a YouTube channel called "Sapjil Coding." The rule is to share only what I've actually built and used. No overstating, crediting AI when AI helped, and saying so when I don't know.
I also built MCP servers to make Korean public data (agricultural products, wholesale markets, and so on) available to AI agents. Some are registered in the A2A agent ecosystem. There's also a Naver News Scraper on the Apify Store — for automatically collecting Korean news.