when I plug in charge n work I feel light electric shock on the side panel of laptop

I have also this problem and I also recently got my new laptop a steel body type. I only feel static discharge when it is plug in. 

Hope this works for you since this is what I did. No more static discharge when charging.

I bought m2 ssd and make it my primary drive and also for OS. 
I then remove my HDD, put it back on.

Then I conclude that HDD power usage/voltage is high that affecting the electric discharge; thus m2 ssd has low power. HDD work less where I can't even hear any sound coming from my laptop. Of course if its working specially at peak usage then it is spinning and I can hear sounds.

I'm not techie, I search all the web concerning the issue. Others said "ground yourself". Or use ground outlet, use static floor-mats and others. I did all of them but sadly it don't work.

My household uses acer laptops, I kinda borrowed my wife's laptop charger and used it. Same with my daughters laptop charger, I used it  but sadly its not the chargers fault. 

I put plants that lessen static charge in the room, I put lot of rings in my fingers (cause they are metal) to try if its work. Sadly it doesn't work.

I consult to the Acer service center near the city I lived in. He told me that it is only natural cause I have metal body laptop and suggest that I return it to the store where I bought it.  That is ridiculous, it is a new laptop.