T-Money Cards in Korea is a must for any foreigner. All of South Korea's transportation system runs on rechargeable smart cards and smart devices. These smart cards are called T-Money cards in Seoul. They are used for subways, buses, taxis, and at some convenience stores like CU/GS25/7-Eleven. T-Money cards are embedded with chips that are readable by card-reading machines. These machines are installed in all subways, buses, and taxis in Seoul. However, you don't have to get a card as this form of chip technology can be put into key chains, rings, bands, and even portable memory sticks. Below we will guide you through the most commonly asked questions regarding T-Money cards in Seoul. If there are any additional questions you might have, feel free to leave your questions in the comments below.