What is "monstar"

"MonStAR" is a CD single by Japanese singer and voice actress Aya Hirano. It was released on December 5, 2007 and was produced by Lantis. This is Aya Hirano's sixth maxi single and her third and last release from her three-month consecutive single release campaign.

Monstar is a 2013 South Korean television series starring Yong Jun-hyung, Ha Yeon-soo, and Kang Ha-neul. It aired on music channel Mnet (and simultaneously on tvN) from May 17 to August 2, 2013 every Friday at 21:50 for 12 episodes. The drama is about how a group of teenagers are healed through the power of music.