Introduction: Korea Postal service (e-green mail, personalized letter, daily information promotion mail, proof of contents, delivery certificate, cash delivery, complaint mail, residential transfer, recipient delivery location change), post office shopping (special products, flower delivery, traditional market, overseas delivery , Post Office B2B, Post Office Courier, EMS ¡¤ International Mail, Postage Stamp (Postage Book, Postage Stamp, Personal Postage Stamp, Hobby Postage Stamp), Postcard (Picture Postcard, Commemorative Postcard, e-Green Postcard, Custom Postcard), Greeting Card, Affordable Phone, gold bar