if I applied for hongkong visa by post from south korea with bangladeshi passport.

I found this from the website of CVASC in South Korea:"By post: Make the payment through remittance.The Visa Center staff will inform you of the amount of payment when your passport is ready for return.You can remit the payment to the Visa center,and indicate your passport number and pickup form in the remittance information column." You are advised to contact the visa office to confirm that.