The year 2020 is a combination of "gyeong" (庚) as a celestial stem and "ja" (子) as a terrestrial branch. Gyeong is metal, one of the five elements and white in color, while ja is symbolized as a rat in its zodiac animal, so simply the year of gyeong-ja, 2020, is a white rat. From the perspective of the five elements, gyeong is white metal and ja is black water, so 'gyeong-ja' year can be defined as a contradiction of black and white and a combination of metal and water. They mutually generate but contrast with each other. It may explain the tendency for the energy of cold metal to circulate downward flowing.

In Saju, metals out of the five elements are divided into two types. Gyeong, the yang metal, represents a raw metal substrate. When gyeong metal meets the black water of ja, it tends to fix, reform and judge.

…….so, 2020 is a year to fix, reform, and JUDGE

https://www.koreatimes.co.kr/www/culture/2020/01/148_281309.html