Last night at the hotel I polished the trainees’ presentation decks, then vibe-coded an infographic maker web app that one of them had asked for. Until dawn. This morning I arrived at the Hyosung Information Systems training center. While the trainees each prepared their PPT presentations, I built another app on the spot: a 9-item evaluation web app that draws a radar chart automatically as you enter scores. It went into real use the moment the presentations began. And it works great.
Yesterday evening I wrapped up by demonstrating how to vibe code with Claude Code. But trouble hit at exactly that moment. News that "Claude Code is being dropped from the $20/month Pro plan" rattled the training room, just as I was telling everyone, "You can build things like this with this tool, too." Checking again this morning, they had reversed it. Anthropic explained it was "a small test on 2% of new sign-ups." …Is this a joke? For a moment...
Either way, being able to respond to trainees’ needs on the spot and build a working web app is clearly a big change. It’s a way of teaching I couldn’t have imagined two years ago.
23 Apr 2026
[ Instructor: John Kim ]