Ceiling with a long, narrow gap where a partition wall was removed, showing exposed insulation and drywall edges in a partially renovated room.

I'm renovating one of the bedrooms in the apartment. The previous owner had demolished a wall, thus turning two smaller bedrooms into one large one. He concealed the gap in the ceiling with a really ugly and quite thick chipboard/plank along the gap, which we have removed. How do I fix this in the best way? My first thought was to just glue 4 mm plywood along it to just cover the ugly gap, but my partner doesn't agree (sigh). (It must not, in any way, be visible that there was once a wall there). The groove/gap is about 8.5-10 cm wide, depending on how you measure.

1. Put new ceiling drywall over the old one for the entire room?
2. Any other better solution that gives a nice result?
 
Are there finished panels in the ceiling that form a visible pattern? If so, it may be difficult to fix without building a new ceiling. You might be able to take down the panels in the smaller room and the narrower strip visible in the picture, and then install a new ceiling in that section with similar ceiling panels. However, there's a risk of a color shift, so repainting may be necessary.

If it's drywall, you can screw plywood pieces above the existing drywall, cut out an appropriately sized piece of drywall and then screw it into the plywood, then plaster and sand and plaster and sand until the hole is gone. Essentially the same technique as when repairing a hole in a drywall.
 
It is a gypsum ceiling that is suspended from the concrete ceiling. The gypsum boards are a standard variant with beveled edges and there is a pattern as the boards are mounted with staggered joints.
 
One option should then be to repair the plaster, then fill the joint and all beveled edges, sand, and paint the ceiling. That should give you a smooth ceiling.

Are you thinking of doing something fun in the ceiling, like embedding speakers, spotlights, or installing more lights? You have the chance now while it's open. If you make holes with a hole saw where the items will be placed, you should be able to fish through a flexible conduit, perhaps with the help of a regular drain rod.
 
Install sparse c/c 30 and then nice ceiling panels on it.
 
I don't quite understand how I can attach a piece of plasterboard there when there's really nothing to attach it to. The old wall studs are just cut off where the ceiling begins. The previous owner then attached wooden blocks to them, which he then screwed the particle board into.

Gap in wall showing cut studs and attached wooden blocks for panel support.
 
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