I have heard that giving money as a present is considered thoughtless in some cultures. However in Korea, it considered to be one of the best gifts you can give. This is especially true for weddings and funerals.  

At weddings, people will often gift the bride and groom around 50,000 won to 300,000 won before the ceremony starts. You are supposed to bring your gift in an envelope, but many couples will have envelopes avaliable at the enterance to the venue in case you forgot one.

At funerals, it is also common to give the grieving family 50,000 won to 300,000 won. This tradition is supposed to help the family pay for the funeral.

So, don’t be surprised when you see ATM machines outside wedding halls and funeral homes.