0xY4BL0K0/Яблоко/apple, n.

Jinho Kim.

Student at Korea University.
The handle is for knowledge — the kind you take a bite of.

CV →Writing →GitHub ↗LinkedIn ↗

01 / Featured

The latest.

A two-dimensional map of a synthetic Korean electorate

Jul 2026·14 min·AI

Demos: the million-persona model that called Korea's local elections

We built a synthetic electorate — one million personas, one sovereign Korean LLM, a two-dimensional ideology space — and locked its forecast for the June 2026 nationwide local elections before the vote. It called 15 of 16 governor races and 192 of 223 mayoral races, with zero opinion polls anywhere in the pipeline. The method, written out with the actual math — plus the one structural flaw that almost sank it, and the fix.

Read the essay →

02 / Writing

Recent posts.

A two-dimensional map of a synthetic Korean electorate

We built a synthetic electorate — one million personas, one sovereign Korean LLM, a two-dimensional ideology space — and locked its forecast for the June 2026 nationwide local elections before the vote. It called 15 of 16 governor races and 192 of 223 mayoral races, with zero opinion polls anywhere in the pipeline. The method, written out with the actual math — plus the one structural flaw that almost sank it, and the fix.

Demos: the million-persona model that called Korea's local elections

We built a synthetic electorate — one million personas, one sovereign Korean LLM, a two-dimensional ideology space — and locked its forecast for the June 2026 nationwide local elections before the vote. It called 15 of 16 governor races and 192 of 223 mayoral races, with zero opinion polls anywhere in the pipeline. The method, written out with the actual math — plus the one structural flaw that almost sank it, and the fix.

A supersingular isogeny graph

SIDH was one of the last key-exchange schemes standing in NIST's post-quantum competition. Then a classical laptop recovered its secret key in an hour. How it works, the one formula that forces it to leak, and the two-dimensional trick that breaks it — with the actual math — plus a challenge so you can watch it fall.

Jun 2026·Crypto

Sike: the post-quantum scheme that fell to a laptop

SIDH was one of the last key-exchange schemes standing in NIST's post-quantum competition. Then a classical laptop recovered its secret key in an hour. How it works, the one formula that forces it to leak, and the two-dimensional trick that breaks it — with the actual math — plus a challenge so you can watch it fall.

Adversarial perturbation lattice

Three years after building an image-copyright framework as a high-schooler, a look at what held up, what didn't, and where the current wave of adversarial-perturbation research is actually pointed.

Apr 2026·Essay

Poisoning the well: why image-generators keep eating copyrighted data.

Three years after building an image-copyright framework as a high-schooler, a look at what held up, what didn't, and where the current wave of adversarial-perturbation research is actually pointed.

All writing →

03 / Hobbies

Off the clock.

Nothing to do with anything above —
books, music, and chess.

Why Nations Fail cover

Acemoglu & RobinsonReading

Notes from Underground cover

F. DostoevskyDone

Nausea cover

J.-P. SartreDone

Music →Chess →

04 / Contact

Say hello —
jhk0317 at
korea dot ac dot kr