Treat Changwon as a multi-center city, not one compact station district. The official Changwon Bus Information System covers Uichang-gu, Seongsan-gu, Masanhappo-gu, Masanhoewon-gu and Jinhae-gu, and provides route search, stop search, pathfinding, operating timetables, fares/transfers and live arrival information.
Before you buy a long-distance ticket or tell a taxi driver only 'Changwon,' save the exact Korean name of your destination and identify whether it is in Changwon proper, Masan or Jinhae. That one step can prevent a long cross-city backtrack after arrival. Once your arrival hub is fixed, use the city's pathfinder or stop search for the last bus instead of copying an old route number from a blog.
For late arrivals, check the return or final service as well as the outbound route. Festival days, major events and road controls can also affect journey times or temporary routing, so recheck the BIS notices and live arrivals on the day. The official system includes a low-floor-bus filter, which can also help travelers who need step-free boarding options, though vehicle availability on a specific trip still needs to be checked.
If a live route looks too indirect or the final service has finished, compare a taxi for the last leg rather than forcing a multi-transfer bus journey. The practical sequence is: exact district, exact stop, live arrival, return plan.