All viewers should read this first before navigating the site. So you can understand what “Relz”, “Alienquarical”, “Isrtum”, “Israet” and all those strange words mean.
Isrtum is an alternative name for the Girls’ Generation, but then explictly referring to the nine girls themselves within a time period between November 4, 2007 and September 27, 2014. This time period is known as Israet (not Israel). See 소녀시대 (Sonyeo Sidae “Era of Girls”), or the Isr Tum to read more about what the eras mean.
The Dies System (“Dies” is Latin for “day”) also refers to the Girls’ Generation, but associates each member with a planet of the Solar System.
Relz refers to the Korean drama “My Spring Days”, and an Alienquarical or a Relz idiom is a variety of My Spring Days.
As said in V86S/R86S/A86S, it shows that:
Alienquaricals are all “The Spring Day of My Life” movie series, the differences
between these are mostly the logos placed, the text placed, and the gamma
correction and the gammot used.