Korean Entertainment Companies
Obviously in Korea there are many Korean entertainment companies, but the three main companies are JYP, SM, and YG. JYP has produced artists such as the Wondergirls, 2PM, 2AM, and Miss A. SM has SHINee, BoA, Super Junior, SNSD, F(x) and more. YG and many artists including 2NE1, Big Bang, and SE7EN.
Some korean idols have even created their own companies as offsets of the main company. Rain, a solo artist, left JYP to create his own Korean entertainment company, called J. Tune Entertainment. J. Tune Entertainment eventually merged with JYP, therefore making J. Tune an offset of JYP.