Here's two idols who got trained for the longest period in SM entertainment.
It seems natural for Idols to train for so long because they need to perform perfectly in dancing, singing and even acting. If there were rookie idols who are perfectly good at everything right after the debut, they would not have to practice so much. However, that kind of perfect person doesn't exist and we all know it. That's why idols keep practicing every day and night before and after the debut. Idols often talks about how hard training was before. Sometimes, they told that it was too frustrating to wait for only debut without knowing when it becomes reality. Besides, some idols waited over 3~4 years for debut, I think it's the average, because there are some idols who trained for 7, 8 years before the debut. Guess who they are! Let's check it out, below.
1. NCT's Johnny : Trained for 9 years
February 9, 1995
Entered SM entertainment in 2008
Debuted in 2017
2. Jessica: Trained for 7 years and half
April 18th, 1989
Entered SM entertainment in 2000
Debuted in 2007