Before
예약(하다) = reservation
예정(이다) = prearrange, plan
예상(하다) = expect, anticipate
예방(하다) = prevent
예매(하다) = buy (tickets) in advance
예열(하다) = preheat
예산 = budget
예고 = movie trailer
일기예보 = weather forecast
예방접종 = vaccination
예전 = the old days, a long time ago
옛날 = the old days
Etiquette (also 례)
예절 = propriety, etiquette, manners
예의 = manners, etiquette
무례(하다) = impolite, rude (무 = without)
실례(하다) = rude (실 = loss)
Sutdy-Korean 