This is the 6859th most frequent Korean word.
일정은
"일정은" means "schedule is" or "schedule" (as a topic).
'일정은' highlights the topic of how busy the schedule was.
그들의 일정은 매우 바빴어요.
Their schedule was very busy.
'일정은' is used here to denote 'schedule' as the topic of the sentence, with an inquiring tone about plans.
내일 우리의 일정은 무엇인가요?
What is our schedule for tomorrow?
'일정은' refers to a fixed or set schedule, specifying the timing for an event.