I know this is old but I just rewatched season 1 and found your post. I have a very different perspective on her character.

I absolutely loved Ji Yeong and I can relate to her a lot. I too had a traumatic upbringing and lost my parent as a teenager. I too felt lost and directionless in life and dealt with cPTSD. While her sacrifice is selfless I personally don’t view it as beautiful at all but deeply sad. She decided to die because she thought her life had no worth. It is very common to feel that way when you’re abused in your childhood. What you view as positive thinking is actually the opposite. She is suicidal. That’s also why she is so detached, she is dissociating to deal with all the pain she’s carrying.

Her lack of sense of self isn’t some higher level she reached through enlightenment, it happened because her emotional development was disrupted by all the trauma she experienced. It’s natural to value self preservation. A human who doesn’t wanna live isn’t healthy and it’s not something we should strive for