Daejeon is South Korea's central crossroads: a major rail junction, administrative city, and research hub about an hour from Seoul by KTX. It is less immediately showy than Seoul or Busan, but it works well as a practical base for central Korea and has a calm, local rhythm.
The city grew around transport and science. Expo 1993 left a cluster of museums and public spaces near the river, while Daedeok Innopolis made Daejeon one of Korea's main research centres. The broad streets of Dunsan feel planned and modern, but older market streets around Daejeon Station still have ginseng shops, bakeries, and everyday city life.
Daejeon's best sights are spread out. Hanbat Arboretum and the museum district are good easy wins, Yuseong Spa gives the city its old resort identity, and the surrounding hills offer quick walks. Food travellers usually make time for Sungsimdang, the beloved bakery that has become a civic institution.
The city is especially useful if you want a lower-key stop between Seoul, Daegu, and the Baekje heritage sites.