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LazyPup and HayZee518, thank you for your suggestions!
I've crawled all over the place, I checked the sink, the tub, the toilet and the space around them, the space under them carefully, didn't notice any trace of water, the valve and pipe all seems secure. A friend suggests it might be a worn out wax ring, but the situation remain even after we replaced the ring. I checked the 1st floor ceiling right underneath the 2nd floor bathroom, and didn't see any trace of wet spot.
I have also checked the pipe network hanging on the basement ceiling, I touched and felt them with my hands, but I didn't spot any trace of moisture on them though, they all seem dry and secure.
I think LazyPup made an interesting comment in saying the problem might be with the supply side, I suspect that is true, since the dripping is so clear and cold, and I also suspect the leak is right before it even got send up to 1st or 2nd floor, but right inside the ceiling.
Dear God, I hope that's not the case. I think I should call in a professional to end this torture.
Thank you for your help!
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