Apparently, the girl in this picture is from a story called "Please Teach Me, Tutor" from Novelpia (according to the novelpia tag in pixiv).
Original Korean version: https://novelpia.com/novel/170564
Translated version: https://pandamtl.com/series/please-teach-me-tutor/
(The translation is not the best but you can still understand the story)

Her story started at Chapter 143 if anyone's wondering.