KST is a public bus transportation group comprising Kyungwon Passenger, Siheung Transportation, Circle Line, and Taehwa Transportation. Its official website provides information and customer support for the services operated by these four companies, with route information organized by operator. Passengers can check service notices covering timetable changes, detours, stop changes, seasonal schedules, and adjustments related to local events. The site also shares guidance on bus policies, including restrictions on items brought aboard, and directs passengers with transit card fare-refund questions to the relevant card service provider.

KST emphasizes safe bus operations and a clean environment. Its website offers a customer feedback channel where passengers can raise concerns or make requests, alongside company announcements and recruitment notices for bus drivers. These resources help riders stay informed about service changes and communicate with the group. KST is based in Ansan, Gyeonggi Province, and provides contact details for inquiries. Through its operating companies, the group supports bus travel and keeps passengers updated on route and schedule information.