This study aims to establish the entire system of Korean demonstratives, focusing on time demonstratives. Until now, research on the system of Korean demonstratives has mainly been focused on spatial demonstratives. As a result, it has been concluded that ‘i(이)’ functions as a ‘speaker near indicate’, ‘geu(그)’ as a ‘addressee near indicate’, and ‘jeo(저)’ as a ‘speaker·addressee far indicate.’ However, this system is only fit for the use of spatial demonstratives and fails to properly explain the uses of other demonstratives. In Chapter 3, this paper clarifies that in the case of time demonstratives, deictic projection occurs in the ‘axis of time’ rather than in the ‘axis of person.’ Thus, it is understood that time demonstratives can be categorized into an opposition system of ‘i(이)’ as a ‘speech time near indicate,’ ‘geu(그)’ as an ‘event time near indicate’, and ‘jeo(저)’ as a ‘speech time far indicate.’ In Chapter 4, I simplify this opposition system of time demonstratives into ‘i(이)-deictic axis near indicate’, ‘geu(그)-projected deictic axis near indicate’, and ‘jeo(저)-deictic axis far indicate’. I argue that this new opposition system of demonstratives is able to properly explain the usage of all kinds of demonstratives.