1. The Two Main Speech Levels: Polite (-yo) vs Formal (-sumnida)
Informal Polite (Haeyo-che / 해요체): Ends in -a/eo-yo. This is the most versatile speech style in modern Korea. It is warm, polite, and universally suitable for colleagues, service staff, and casual acquaintances.
Formal Polite (Hapsio-che / 하십시오체): Ends in -sumnida/-sumnikka. This register is reserved for television broadcasts, company presentations, military communication, and customer announcements.
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Key Takeaway
When in doubt, always use Haeyo-che (-yo). It is never rude and avoids feeling excessively distant.