It means internal piping is leaking water.

Find the plumber that use sonar to identify leaking point. No need hack.

Fast and efficient. Don't use low tech plumber. He go hack all your ceiling and floor you will die.

Another confirmation is turn off all water.

Release all water until all pipe no water

Flush the toilet bowl until no water

Stay one night in hotel
Then come back ask if the leaking still got

If don't have 100% pipe leaked

idea.

dye the water.
see same color water appeared or not.
don't say what color you used.

Wow... Wow... Real experienced advices! Thanks!
Anyways, the floor should waterproof good enough since renovation 15 years ago! And, I think your 3rd point perhaps the issue of the current incident!

Ok. The injection, yes I saw that works before in my office! And it seems quite work well ya!

Another consideration, whether those Acrylic Waterproof Liquid products Ok for my leaking issue? I heard many of them out there used it and quiet happy with the result! What do you think?

Lastly, as your experience, that's definitely not the Pipes Cracked (inside wall) ?

I dunno how your piping work, but usually the pipe will not go so near with the drainage pipe...

Old condo pipe some are pipe go from ground and go up.. some are from up to down..

But for ur case, maybe u ask for drawing from management..
And usually condo unit pipe rarely burst one la... usually la
If there is a burst, the leak will be very powerful and spread round round area watermark one.. i dunno for ur case la.

Best option now is do PU injection and hope it works..
If dun works, then only do hacking..

I had similar complain from downstair neighbor about leaking in toilet.

Upon checking realized those old tile grout were cracked and some were missing along the toilet floor and wall.

Managed to resolved by resealing all the corners and tile gaps in toilet with silicone sealant.

Wow... That simple? How & where was the leaking point if observe from downstairs?

As what I can see, those piping system from up to down (stop valve at ceiling/above plaster ceiling)
If pipe burst, then injection will help? It doesn't solve the pipe cracked?!
In facts, water pressure in house very super low, so will this causes burst pipe?
Wow... That simple? How & where was the leaking point if observe from downstairs?

Thanks! In fact what is Gully Trap? And, which screw in cap means?

Update:
6 hours of Not Using Toilet, neighbor reports "Still Leaking/water dripping"!

What does it mean?

I see! So,
1) what material to use to coloring water?
2) pour the coloring water on the floor and dye the water of the toilet flushing container?

Wow... Wow... Real experienced advices! Thanks!
Anyways, the floor should waterproof good enough since renovation 15 years ago! And, I think your 3rd point perhaps the issue of the current incident!

Ok. The injection, yes I saw that works before in my office! And it seems quite work well ya!

Another consideration, whether those Acrylic Waterproof Liquid products Ok for my leaking issue? I heard many of them out there used it and quiet happy with the result! What do you think?

Lastly, as your experience, that's definitely not the Pipes Cracked (inside wall) ?

Appreciate all your advices and suggestions!
Ya hor, don't know why video wasn't attached?!🤔
But my pipe has converted to PVC, shouldn't have brownish water?
Oh? Mine is Blue Pipes leh... Why so sure it's that issue? Always cracked?

Done this last year.. neighbour upstairs leaking to my toilet. Report to mgmt..then plumber come fix invoice to owner above..the 6 months later unit below complaint leaking same thing plumber come mgmt bill me for the repair.

Guys, appreciate all your precious replies!
The update here is — Maybe the Connection/Joint from the Toilet Bowl to the Main Sewage Pipe leaking!

And the management said "it's INSIDE Your House NOT OUTSIDE of your house, so Owner have to bare it themselves"

CORRECT?

Done this last year.. neighbour upstairs leaking to my toilet. Report to mgmt..then plumber come fix invoice to owner above..the 6 months later unit below complaint leaking same thing plumber come mgmt bill me for the repair.