Lee Haeun
Principal teacher since 2014. She sets the studio sequence, chooses the chart packs for clean swings rather than dramatic ones, and closes each three-week book in person.
Established 2014 · Busan
A room that teaches people to mark the sheet
The official registered business name is Logic Mosaic. The study room was established in 2014 and still teaches in English at 45 Haeundaehaebyeon-ro, Haeundae-gu, Busan, 48094.
How the room started
In 2014 Lee Haeun rented a small evening space near Haeundae beach and began teaching shopkeepers and office workers how to mark a weekly trend without inventing swings that were not there. She had spent the four years before that as a junior clerk at a Busan brokerage desk, inking end-of-day charts after the room closed. The teaching grew out of that habit: slow marks, named out loud, kept on paper.
By 2019 the class no longer fit the rented room. Logic Mosaic moved to the current address in Haeundae-gu. The desk, the eight chairs, and the rule about one timeframe per sheet came with the move. Park Soyeon joined in 2021, after economics study at Pusan National University and two years drawing channels for a research newsletter. She reviews markup during studio evenings and in one-to-one sittings.
How an evening is taught
Students mark alone before anyone talks. Comparison comes second, so a person cannot borrow a neighbour’s slope and call it their own. Corrections are written on the sheet in another pencil, not collected into a slide. The chart pack stays with the student. Logic Mosaic keeps the lesson sequence and the blank packs.
The subject is technical analysis training in the old sense: chart trends, price channels, and market structure. Hours in the room go to marking paper. Orders stay with each student and their own broker.
People at the desk
Park Soyeon
Markup reviewer since 2021. She checks channel touches and swing labels, especially on evenings four and six of the studio, and she takes one-to-one review sittings during the week.