There are 2 sites who have fully translated the C-novel and both are good quality translations with their own different translating styles so feel free to choose, or check the both of them out.
Dreams of Jianghu translation of 'One Smile Is Very Devastating': https://dreamsofjianghu.ca/just-one-smile-is-very-alluring/table-of-contents/
Lil' Bliss' translation of 'A Slight Smile Is Very Charming': http://bookbychapters.com/category/translations/a-slight-smile-is-very-charming/
FYI, Lil Bliss has even translated the side stories and crossovers. And on a personal note, I prefer Lil Bliss' overall translation of the C-novel - her translations are really easy to read and follow while Dreams of Jianghu's comes across more technically accurate. :)
