Kind of ignoring the extras but au where post Canon the system uninstalls itself and with it goes Shen Qingqiu’s (verbal) language understanding. Apparently, because PIDW was loosely based in fantasy past china (xianxia), the common spoken language (now that the world is real) is not modern mandarin. Shen Qingqiu didn't realize this because the system just translated everything (both what was spoken and what he said) for him.
So after the System uninstalls itself Shen Qingqiu can't understand anyone! Thankfully he can still read but not being able to verbally communicate with anyone is quite alarming, especially to his husband. Shen Qingqiu is deemed not to be suffering from any curse, which concerns Luo Binghe even more. Lucky enough Luo Binghe is well versed in reading his husband's body language and expressions, so at least basic things are covered. Though Shen Qingqiu has to admit that its still really hard not being able to communicate without a brush a paper! So, Shen Qingqiu endeavors to learn a new language, his husband doing the same. They end up somewhat meeting in the middle where Shen Qingqiu has a basic understanding of the language of his now home and Luo Binghe can understand mandarin somewhat
