At Busan Modern and Contemporary History Museum, distinguish general museum admission from the children's experience room called Deullak-Nallak. The official information lists advance booking for each session.
The seven daily sessions are 09:30–10:20, 10:30–11:20, 11:30–12:20, 14:00–14:50, 15:00–15:50, 16:00–16:50 and 17:00–17:50. A maintenance break is listed between midday sessions. Admission to a session is not permitted more than 20 minutes after its start. Check available dates, ages and reservation conditions on Busan's official booking service.
The general museum is free and lists 09:00–18:00, with ordinary entry until 17:00. It closes on Mondays and January 1; holiday-Monday closures shift to the following day or after the holiday period.
Arrive ahead of the reserved session, check guardian requirements and do not assume that free general admission allows walk-in access to the children's room.