Lunch with coworkers

At noon the whole office moves as one organism. 점심 먹으러 가요! (let's go eat lunch) — you go, even if not hungry. Social math.

Ordering together means sharing banchan and splitting the bill (각자 or 한 사람이 사요 — sometimes the senior pays; say 감사합니다, return it next time).

Post-lunch coffee run (커피 타임) is optional but career-enhancing — just bring the change.