Here's how I solved the issue of abnormal fonts in Deepin applications.
The difficulty in promoting Linux in China is mostly due to the unfriendliness of certain major Chinese companies towards Linux systems on the user end (excluding Android).
Deepin, as a company, has made many software ports, such as Foxmail and TIM. Although they run in a customized version of Wine, they are still usable. However, the downside is that the Windows environment in deepin-wine seems to lack font files, which results in incorrect font rendering in the software interface.
As for the solution, I extracted the fonts from a Windows 10 virtual machine and created a symbolic link (to save space) to the font folder in the container (~/.deepinwine/Deepin-Foxmail/drive_c/windows/Fonts). That fixed the issue.