Why KR marketers rebuild audiences every quarter

Korean e-commerce calendars cluster promotions around holidays that do not match global retail peaks. When teams import last quarter's audience stacks without a reset checklist, frequency caps break and prospecting pools inherit promo-fatigued users.

We teach a quarterly rebuild that starts with suppression hygiene, not new lookalikes. The first hour is audit: which lists grew from accidental broad targeting, which CRM exports stalled mid-sync.

The second phase re-seeds prospecting from purchasers with a 90-day window, not all-time buyers. The third phase documents what changed so the next media buyer does not reverse your work.

This is not about chasing novelty—it is about making rebuilds predictable enough to schedule alongside campaign planning.