System Font Error

Hi All,

I have recently run into this weird system font. I have attached a screenshot to show what I mean by the weird error font. I don't remember me doing anything related to the font or the system system but just happened the next day. I have tried to seek for solution online but not successful, perhaps cause i can't explain it in detail.

Please can anyone help and let me know if there is any way that I can reverse it back to default original. Thank you very much.