“Maknae” (막내) — the youngest is a job, not a fact
English says “the youngest” and stops. Korean assigns duties: get indulged, run the errands, pour the drinks, and do not try to lead.
workplace korean
“-ssi” and “-nim” (씨 · 님) — the suffix that sets your rank
Every textbook teaches 씨 as “the polite one”. Attach it to a surname alone, or to anyone senior to you, and it is the opposite of polite.
“Sugohaesseoyo” — the everyday phrase that can still get you in trouble
The most-used sentence in Korean working life, and there is a live argument about whether you are allowed to say it to your boss. Both sides are real and it splits by age.