Haru Journal

A workbench with a volatile paper-chart model, a small green signal light, a stop button, a calculator secured by a safety belt, and a blank investment notebook

Investment & EconomyAugust 1, 2026

The day KOSPI jumped 17%, my indicator flashed buy too

As KOSPI and KOSDAQ rebounded violently and SK hynix hit its upper limit, I reconsidered the meaning and limits of a signal I originally built for crypto.

7 min readRead story

A morning workbench with interchangeable model cards, a locked key box, a provenance tag, and a human approval switch

Daily IssuesAugust 1, 2026

Models change while permissions remain, so today I thought about operational boundaries

AI transparency codes, team-level model policies, npm token restrictions, and agent secret scanning made me value replaceable, stoppable operations over another new feature.

6 min readRead story

Two children excitedly watch a beetle enclosure while their mother recoils and Coco rests nearby without interest

Kids & GamesJuly 31, 2026

A rhinoceros beetle has joined our family

We began raising a rhinoceros beetle: first came the supplies, then two delighted children, a startled wife, and Coco showing absolutely no interest.

5 min readRead story

A developer seen from behind in a quiet dawn operations room, facing abstract status screens and handover notes

Haru Space LabJuly 31, 2026

What remains after launch, and the weight of maintenance

While imagining Haru Space after launch, I reflect on the burden left with a smaller team, the limits of handover, and how to make response faster without relying on sacrifice.

8 min readRead story

Paper models representing heat, AI, the economy, and health connected by a blue thread to a human approval switch

Daily IssuesJuly 30, 2026

A 39°C heat forecast and AI labels made me think about the duty to warn early

Heat alerts, AI transparency rules, an uneven global outlook, and dementia guidance all reminded me that risk and uncertainty must be visible before people can choose.

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A developer seen from behind in a rainy nighttime home office, reflecting over many notebooks and abstract design screens

Haru Space LabJuly 30, 2026

Why a middle-aged man with too many ideas started Haru Space

I still feel short on design and technical skill, but years of broken records, doubt about the AI era, and a new ability to build led me to start Haru Space.

6 min readRead story

A laptop, verification checklist, and several isolated work models on an early-morning desk

Daily IssuesJuly 30, 2026

This morning's AI news made me think less about intelligence and more about verification

After reading about agents, isolated environments, code review, and a sharp market selloff, I kept coming back to the structure that divides work and verifies it.

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A developer at a sunlit morning desk building a model of small spaces connected by a path, with an open blank notebook nearby

Haru Space LabJuly 30, 2026

Building Haru Space and recording the journey

Why I began building Haru Space as a place where trusted people can shape ideas together, and what I plan to record along the way.

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An evening desk where a fresh investment journal is about to begin beside a laptop showing a market chart

Investment & EconomyJuly 30, 2026

A Working Developer Finally Starts an Investment Journal

I am restarting the investment notes and automated-trading experiments I kept postponing, using AI to help turn a long-standing interest into a practical routine.

5 min readRead story

A sunlit table holding a shopping tote, food, coffee, fishing gear, a map, and a blank notebook

Life & CultureJuly 30, 2026

Recording what I buy, eat, fish for, and discover

I am beginning a personal record of things I use, restaurants worth revisiting, fishing I rarely have time for, and places I want to remember.

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A parent and two children walking through a neighborhood park with their companion dog Coco in the late afternoon

Kids & GamesJuly 30, 2026

Two kids and Coco—the beginning of our lively family record

I am beginning a record of raising two very different children, caring for fourteen-year-old Coco's health, and preserving our ordinary days together.

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People reviewing paper idea cards, a small model, and a tablet together at a worktable

AI & TechnologyJuly 29, 2026

How to begin a small project with AI

A practical way to turn a vague idea into a small, testable outcome while keeping people responsible for the decisions.

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A mixed-age group reviewing photographs and a finished booklet together at a library table

Haru Space LabJuly 28, 2026

How collaborative records help the next person

Move beyond an archive of outputs by preserving the reasons, lessons, and publishing decisions that can improve the next collaboration.

4 min readRead story

New stories

The day KOSPI jumped 17%, my indicator flashed buy too

Models change while permissions remain, so today I thought about operational boundaries

A rhinoceros beetle has joined our family

What remains after launch, and the weight of maintenance

A 39°C heat forecast and AI labels made me think about the duty to warn early

Why a middle-aged man with too many ideas started Haru Space

The day KOSPI jumped 17%, my indicator flashed buy too

Models change while permissions remain, so today I thought about operational boundaries

A rhinoceros beetle has joined our family

What remains after launch, and the weight of maintenance

A 39°C heat forecast and AI labels made me think about the duty to warn early

Why a middle-aged man with too many ideas started Haru Space

This morning's AI news made me think less about intelligence and more about verification

Building Haru Space and recording the journey

A Working Developer Finally Starts an Investment Journal

Recording what I buy, eat, fish for, and discover

Two kids and Coco—the beginning of our lively family record

How to begin a small project with AI

How collaborative records help the next person

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