What do Zhang Xiaobing Ga mean by red beans and black beans?

Soldier Zhang Ga red beans and black beans mean: red beans count as a sum, and black beans count as a sum.

Soldier Zhang Ga is adapted from the novella of the same name by writer Xu Guangyao. This is a 20-episode TV series, directed by Geng Xu, written by Bing Xu and co-starred by Xie Mengwei, Du Yu, Zray, Wang Shasha and Qian Duoduo. It tells the story of how Baoding, Hebei Province became a veritable Eighth Route Army soldier under the guidance of Lao Zhongshu, Qian Captain and Grandma.

In the play, red beans symbolize merit and black beans symbolize negligence. Every time you make meritorious service, you get a red bean, and vice versa.