Cindy Song was a senior attending Penn State, when she would go out for Halloween with some friends. After a fun night out, her friends would drop her off at her apartment, and this would be the last time anyone would see or hear from her.

Sources:

https://charleyproject.org/case/hyun-jong-song

https://www.truecrimeedition.com/post/cindy-song

https://www.wtaj.com/wtaj-plus/have-you-seen-me/have-you-seen-me-case-2-cindy-song/