Research Process: South Korea Geopolitical Profile

Environment

• model: gpt-5.4-mini
• skill: research-report
• prompt source: ops/codex/prompts/daily-issue-research.md

Research Instruction

• issue number: #50
• issue title: [15/50][東アジア] 韓国の国際政治上の論点を調査する
• publishable request summary: Research South Korea’s region history, political system, security, economy, and civic life, and turn it into a country profile that helps readers follow the news.
• scope constraints: The report must cover the strong presidency, conservative-progressive conflict, prosecutors, chaebol, media, North Korea, the U.S. alliance, Japan relations, dependence on China, semiconductors, shipbuilding, batteries, K-culture, low fertility, conscription, gender tension, housing, and youth issues, with Japan and East Asia implications.
• inferred deliverable: A durable country profile with Japanese and English articles, source notes, a public research log, and a MIX alignment file.

What I checked

• I confirmed that South Korea is easiest to read as a country balancing deterrence of North Korea, alliance management with the United States, and economic exposure to China and Japan.
• I confirmed that the president in autumn 2026 is Lee Jae Myung and that the public policy frame still combines dialogue and deterrence.
• I confirmed that the single five-year presidential term and unicameral legislature make power transfers sharper than in many parliamentary systems.
• I confirmed that large China trade and the U.S. alliance form a basic dual constraint on foreign policy.
• I confirmed that semiconductors and shipbuilding sit at the intersection of exports, jobs, diplomacy, and supply chains.
• I confirmed that low fertility, housing pressure, and military service all weigh on younger households at once.

Main sources used

• Korea.net for constitutional structure, government system, and historical overview.
• The foreign ministry for North Korea, the U.S. alliance, China, and Japan policy framing.
• Statistics Korea for fertility, aging, and household pressure.
• The Bank of Korea for the interest-rate backdrop.
• MOTIE for exports, semiconductors, and shipbuilding.
• MCST for K-culture as a diplomatic and industrial asset.
• MMA for the institutional effects of military service.

What I left out

• I did not foreground individual party scandals because they age too quickly for a durable profile.
• I kept headline-driven political updates to a minimum because they can make a long-lived profile brittle.
• I kept the gender and conscription discussion at the institutional level rather than at the level of sensational detail.

Limits

• Public information does not reveal private bargaining inside parties or the real sequence of decisions in a crisis.
• Statistics will change over time, so some economic and demographic figures are time-sensitive.
• The overlaps among North Korea, China, Japan, and industrial policy include inference from public information.