Here I would like to introduce the NRF project “A study on the evolutionary process of late-type stars through maser observations” (called SMASTES: Simultaneous Multi-mAser Survey Toward Evolved Stars) which has been starting since Sept. 2022 with a three year plan. SMASTES aims to study statistically characteristics of SiO and H2O maser properties in ~150 M-type oxygen-rich AGB, ~150 S-type AGB and ~150 post-AGB stars according to evolutionary stage using the upgraded wide four-band receiving system of the KVN. In addition to the existing main observation lines of 22 GHz H2O and 43/42/86/129 GHz (v = 1, 2, J = 1-0; v = 1, J = 2-1, J = 3-2) SiO masers, the SiO v = 3, J = 1-0; v = 2, J = 2-1, 3-2; 28SiO v = 0, J = 1-0, 2-1, 3-2; 29SiO v = 0, J = 1-0, 2-1; 30SiO v = 0, J = 1-0 lines are further observed simultaneously together with CS, HCN, SiS, SO, and SO2 thermal lines. Observations toward ~155 oxygen-rich AGB stars (SMASTES I) were completed between Feb. and June 2023. For observational studies on ~155 S-type stars (SMASTES II), the observations are being carried out by the KVN 2023B proposal since September of this year. The observational proposal for ~150 post-AGB stars (SMASTES III) was submitted for the KVN 2024A season. Through these observations, the characteristics of maser properties, chemical trends associated with characteristics of maser properties, SiO abundance and dust formation etc. will be explored according to the oxygen-rich AGB, S-type AGB, and post-AGB phases. A kinematic acceleration of mass loss and asymmetric outflows from the central star to atmosphere → dust layer → outer circumstellar envelope are also investigated during the evolution of early AGB, thermal pulse late AGB, and post-AGB stars. In particular, observational studies on S-type AGB stars with C/O≈1 as a transitional phase from oxygen-rich to carbon-rich stars and post-AGB stars as a transitional phase from AGB stars to planetary nebulae, which have not been studied much so far, will be focused.