Lost serial number

I seded a under massage few days ago.
"
I reinstalled Mac OS, so I should to reinstall Parallels(version 9).
But my firsttime installing Paralles is few years ago, I remove the purchase confirmation email that contains serial number.
Can I receive my serial number again..?
"
You ask me my email address registered with Parallels Desktop.
But I don't know where I send replying massage..
My email address registered with Parallels is ' @naver.com'
Thanks.

 

Hi LeeEunseul,
Please check your private message & reply.
Thanks,
Dhana.