She Paused Her Lectures Three Weeks Before the Exam. By Noon on Tuesday, All 17 Courses Were Gone. So Were the Reviews.

The number on the page went from 17 to 0.

As of noon on the 10th, Lee Do's instructor page on Etoos — the Korean exam-prep platform where she taught Korean Geography and World Geography — listed zero courses, down from 17. The roughly 100 student reviews attached to those courses also disappeared from the public listing. Visitors to her page got a line saying there were no courses available.

Years of catalog. Years of social proof. One morning.

What happened first

On October 29, with 21 days left until the 2027 CSAT — Korea's national university entrance exam — Lee announced she could not finish the remaining lectures in her Korean Geography and World Geography curriculum, citing health. The notice came as a handwritten letter, in which she said warning signs had appeared in her body one by one and that, on medical advice, she would spend the rest of 2026 taking care of herself for the first time.

For students three weeks from the most consequential test of their lives, that is a curriculum with a hole in it.

Six days later, on November 5, she appeared — looking well — at the production press conference for the new Netflix variety show "Devil's Plan: Dead Again." At the event she described having personally gone to director Jung Jong-yeon to ask to be cast. She said she had even disclosed her own CSAT score, and that she had been desperate to get on. She had also opened a personal YouTube channel, which she used to promote the show.

Public opinion turned on the stated reason for the suspension itself.

The platform moved before the instructor did

On November 9, Etoos posted an apology to students on its official site, saying it had caused great concern to Lee Do's students at an important time ahead of the CSAT. It said it had coordinated schedules and supported filming so the lectures could continue, but the agreed schedule was not kept due to circumstances involving the instructor. It also switched the complaint-filled message board to private and routed course questions to one-on-one customer support.

Then came the catalog deletion. Etoos has not announced any formal measure such as contract termination. Korean outlets have read the removal as the beginning of a push-out.

Lee posted her own handwritten apology to Instagram on the 10th, saying she had been irresponsible. She wrote that she had shaken students' plans at the most important moment and had failed, for the second year running, to carry a curriculum to the end, and that there was no excuse for it. She said she had known about her health problems far earlier and kept delaying the decision; had she been honest sooner, students would have had time to switch to other lectures or materials. What took that time away, she wrote, was not her health but her judgment. She said she would stop broadcast and personal content activity until she recovered, while noting that already-contracted programs still have air dates left.

Health had been the stated reason before: last year she cited a worsening corneal condition that made it hard to look at monitors and write materials, and Etoos told students some of the curriculum would be covered by existing lectures. In late July she said Korean Geography and World Geography lectures would be uploaded by early August. That did not happen either.

The part that should scare creators

Everyone who sells knowledge on a platform tells themselves the same story: the catalog is the asset, the reviews are the moat.

Neither belongs to you.

The courses were real products that real students had paid for. The reviews were years of accumulated trust, written by strangers, impossible to buy. Both sat behind one admin toggle controlled by a company whose first obligation, in a crisis, is to the students and to its own brand.

When that company decided the association was a liability, the product page emptied and the proof emptied with it. The audience was never addressable by the instructor; it was addressable by the platform.

Lee studied geography education at Seoul National University before teaching at Etoos, where she drew attention as the platform's youngest CSAT instructor. Her public profile grew after a Netflix dating show appearance last year — which is, of course, exactly the kind of leverage a hosted instructor builds in order to stop being a hosted instructor.

The 2027 CSAT is on November 19.