The answer is no
At the beginning of a sentence and when it forms part of the proper noun. Examples: Sophomore Class Junior Prom
Junior Year or beginning of Senior
Jacek (Europe )Jersey Milk (Canada)Junior Mints (Canada, USA)Junior Caramels (Canada)
Junior comes before Senior.
Kibum was part of Super Junior since the beginning so he didn't join in a video.
He was a Junior Senator for Illinois.
A junior is the year before senior year in high school. Normally 11th grade.
small fry! x<3