A 'private-room Korean BBQ' listing is useful only if the room fits the actual party and the charge is clear. Seolya Galbi Cheongdam lists 88 seats overall, but only three private rooms: one for four and two for six. A large restaurant capacity is not evidence that one enclosed room can seat a large group.

Match the party to a room
For a two- or three-person party, the official shop information lists a KRW 40,000 private-room charge. The four-person room's charge is waived once the bill reaches KRW 400,000; the six-person room's threshold is KRW 500,000. These are charge-waiver conditions, not mandatory set-menu prices. Availability for a particular date or room cannot be inferred from the number of rooms alone.
Separate an online reservation from a room request
The online booking system accepts groups of two to six. That range includes six guests, but it does not promise either of the two six-person rooms. A business dinner that depends on privacy should confirm the specific room directly. For seven or more guests, ask how ordinary tables or multiple rooms might be arranged rather than assuming a single room will fit everyone.
Allow time for the meal
The current shop page lists dinner from 17:30 to 22:00, last order at 21:00, and temporarily suspended lunch service. The restaurant says trained staff grill at the table. Decide the arrival time, group size and room request together, then check the current menu to budget the meat by its listed 100g unit. None of those steps substitutes for a confirmed reservation.