Nemuri no Mori (2014)

Both are about dancers. Music professional stage dancers genre. Ballet specific. Female leads. Train harx

Nemuri = 1989 novel "Nemuri no Mori" (Kaga Kyoichiro Series #2) by Higashino Keigo.
Kirin = 2011 novel "Kirin no Tsubasa" (Kaga Kyoichiro Series #9) by Higashino Keigo.

Main character = Kaga Kyoichiro by Abe Hiroshi.

Theme = Investigation, drama , death, murder.

Both has ballet. Tough competition. Jealousy. Harsh training. Tough practice. Perfect performance. Talent skill. Balance, beauty, expectation, performance..

Both has ballet. Japanese one is more about murder mystery, Korean one is more family life drama. Both shown dancers determination, peservarance. Their personal life struggle, friendship..