I am making a PCB that uses AC Mains power where 120VAC is converted to 5VDC with the help of AC/DC converter. The 5V output is then supplied to my digital circuitry. The main confusion I have is to whether to connect the neutral point of the Mains power to my common ground of my PCB or not. In theory, it shows no harm. I have shown the example circuit below where I=0 between mains's circuit and my digital circuit but I am still not sure if its still a safe thing to do.
If I did not connect my common ground to the neutral point, would there be any EMI/crosstalk issue on my digital circuitry?