The Time of the Terminally Ill Extra
Ongoing | Ja eunhyang,Kimpeul | 2019 released
dropping after ch 21. the MC's backstory is sad but also not written in a very believable way. I think any reasonable person who still had the freedom she had would've rebelled - ditched the younger sister and gone to tea parties and made friends that way. unless the author made the parents a lot meaner and prevented the MC from ever leaving the house by herself, or prevented her from going to tea parties. the way it's written, it's like the MC was invited to parties, just didn't go because she begrudgingly felt "sisterly duty" to stay behind
The Duchess' Lewd Invitation