Bae Doona was 18 in The Ring Virus when she played the character 'Eun-suh'.
That was over 25 years ago in 1999.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 44, and has starred in 29 movies in total, 26 of those since The Ring Virus was released.
In The Ring Virus, I think Bae Doona looks: