Launched on September 27, 2003, the Science and Technology Satellite-1 (STSAT-1) was South Korea’s first domestically developed satellite for scientific observation. The platform was based on the bus of KITSAT-3, a design newly developed by KAIST at the time. Its scientific instruments included the Far-Ultraviolet Imaging Spectrograph (FIMS), capable of performing both spectroscopy and imaging in the far-ultraviolet range, and the Space Physics Package (SPP), a compact payload designed to measure electrons across a wide energy spectrum, from low to high energies. FIMS was developed as an astronomical observation payload with the primary goal of conducting an all-sky survey of our Galaxy. It was also designed to capture auroral images, and it conducted simultaneous observations with SPP, which measured magnetospheric penetrating particles in polar regions. Although STSAT-1 was operated for approximately one year and faced challenges related to power supply and attitude control that limited its observational capabilities, extensive data analysis efforts ultimately led to the publication of over 50 papers in leading international journals. This colloquium aims to present the development process and scientific achievements of the STSAT-1 payloads, with a particular focus on FIMS.