Secondly, the simplest thing is to look at the price you bought ~ I want to know which album you bought. Korean version is generally not less than 100. Of course, the exchange rate is different now, and the price will be lower.
The third depends on whether there are anti-counterfeiting laser stickers on the box, which are usually numbered.
All the above are summarized by me according to my own many CDs, hoping to help the building!