iHQ Inc., doing business as SidusHQ (Korean: 싸이더스HQ; RR: SsaideoseuHQ) is one of the leading talent management agencies in South Korea.

[2] iHQ, or SidusHQ, is the successor of EBM, an entertainment company founded by producer Teddy Hoon-tak Jung (ko) in 1997.

[3] At this time, Sidus was known as the management company of popular K-pop group g.o.d (as part of a cooperation with music producer and songwriter Park Jin-young of JYP Entertainment) and rising young actors and actresses such as Jang Hyuk, Cha Tae-hyun and Jun Ji-hyun.

The five male protagonists of 'Five Stars' consist of four newcomers discovered by Sidus HQ and one individual selected by netizens who visited a specific website between July 10 and 25.

As the market environment demanded changes, smaller, family-oriented management businesses started to emerge.

[9] In 2011, SidusHQ stars are attracting attention by producing a 'Love Sharing Hanbok Calendar' to practice warm love for neighbors.

It had previously been spun-off as an independent subsidiary company and was home to the likes of Park So-hyun, Lee Yoo-jin and Danny Ahn.