Choung Su Mullen was 19 and living in Bellingham, Washington when she was last seen on February 9, 1989. Described as five feet six inches tall, about 140 pounds, with brown hair and brown eyes, she vanished under vague circumstances: the official record lists only that she was last seen in Bellingham and provides no details about her activities, companions, clothing, or belongings that day.

The Bellingham Police Department opened the case under number 89B05513, but investigators faced few leads and no witnesses, and active search efforts tapered as the weeks and years passed. The case remains open in Whatcom County and unsolved, leaving family and investigators without answers.

If anyone knew Choung, saw her around February 9, 1989, or has information that could help the investigation, please come forward.