Hi and welcome, Narbeh - Nice to have you on board :)
Fake is fake, whether you sell it as if the product was original or sell it as an outright fake, the fact remains that you are selling a fake. Yes you could get in a lot of trouble importing counterfeit products, customs may intercept your package and you will surely get more than you asked for.
If you want to source your products in China, that is perfectly okay. In fact, China is one of the best and cheapest places to source for products. Just be sure you don't get anything branded otherwise you'll end up with fakes and copies of the real thing!
My question is isn't that illegal for someone to buy a fake good and sell it as the original one?
To answer your question - YES it is illegal to buy fakes period and some countries are very strict about this.
Here are news articles of people who have been sentenced or banned for selling counterfeit products -
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Although not all get caught, I still don't think its worth all the risk.
Hope this helps.