Although both seasons are seemingly independent, they both follow the lives of idol students at Kirin High.
Even though they have the same names and places, the plot is similar but completely different. If you like dramas with musicals and performers, you might like this. Never compare them tho, that'll make DreamHigh2 look bad.
It has to do with being who you want to be and following your dreams.You will love this drama if you like romance, music and versatility.