However it depends on who it is. 2AMs Jo Kwon has put up with 7 years training period while Super Juniors Kyuhyun debuted only after 3 months training period. Jae Shim is overseeing all ED training process adapting every SM Ents systematic training system.
Korean idol groups began to appear in the early 20th century.
Just as their K-pop heroes constantly cycle through various concepts to stay fresh students can opt among styles such as hiphop urban and zumba.