I just viewed a 2 yrs old original, unfurnished new condo unit

nego the price with the owner until slightly under market price and decided to view the unit

everything is okay until the owner accidentally talked about new paint. That is when I started to smell something is fishy
So i started to look carefully at every corner and then discovered that a corner of the bedroom ceiling and wall is moldy. An obvious sign of water leaking from the unit above for sometime dy
I was very disappointed..

After some discussion with my wife, we both now 50-50 whether to take the risk
we have nego to slightly below market price and owner promised to rectify the issue before selling to us

on the other hand
We afraid that the unit is a 'lemon' unit( he did mentioned some leakage already fixed, just the current one popped out recently) and the owner wanna let go asap. More surprises are waiting for us once we move in. Forsee more headache and money, time wasted to fix this
and we do not trust the owner's word
Over warranty period according to the developer but owner insist still under warranty till Jan (such a coincidence huh?)

so I would like to seek advice on whether worth to take the risk due to below market price or just let it go?

We decided to gave up that property.
I had asthma during my younger days and I wouldn't want to risk it. Some more that's not the first time the leak happened. It's just like a time bomb

But the seller keep on using scare tactic like got buyer see this weekend, etc. Seems like he is desperate