An idol (Korean: 아이돌; RR: Aidol), in the fandom culture in South Korea, refers to a K-pop artist with a dedicated fanbase. They usually work for a mainstream entertainment agency and have undergone extensive training in dance, vocals, and foreign language. Idols maintain a carefully curated public image and social media presence, and dedicate significant time and resources to building relationships with fans through concerts and meetups.
Hundreds of candidates each day attend the global auditions held by Korean entertainment agencies to perform for the chance of becoming a trainee. Auditions include public auditions and closed auditions. Others are street-cast or scouted without auditioning, based on looks or potential talent. Those who successfully pass this audition stage are offered long-term contracts with the entertainment company. There are no age limits to becoming a trainee; thus is not uncommon for trainees, and even debuted idols, to be very young.
The trainee process lasts for an indefinite period of time, ranging from months to years, and usually involves vocal, dance, and language  classes taken while living together with other trainees, who sometimes attend school at the same time, although some trainees drop out of school to focus on their careers.  The process may include "scouting, auditioning, training, styling, producing, and managing", and was developed around the creation of "H.O.T", a boyband of S.M. Entertainment in late 1990s. Trainees in the same company compete with each other, with some being eliminated from the coveted chance of settling in "the company-owned dormitories", and continue fighting for the chance to debut in new idol groups, while those who cannot show their company the potential to become an eligible idol artist are weeded out of the company.
Once a trainee enters the system, they are regulated in multiple aspects including personal life (for example, dating) to body conditions and visual appearances. The survival, and training and regulation take precedence over natural talent in the production of Korean idols. 
The investment on a potential trainee could be expensive. In 2012, The Wall Street Journal reported that the cost of training one member of Girls' Generation under S.M. Entertainment was US$3 million. 
The K-pop trainee system was popularised by Lee Soo-man, the founder of S.M. Entertainment, as part of a concept labelled cultural technology.  As a unique process, the Korean idol trainee system has been criticised by Western media outlets. There are also negative connotations of idols within independent and underground Korean music scenes. 
When trainees are finally chosen to debut in new groups, they will face a new setting of personalities created by the company to cater the entertainment market. Each member of an idol group has his or her own character to play and therefore an important part of their job duties is to maintain that temperament in any kind of exposure they may get. One way to build personal image of idol groups is through social media services with contents taken care by the company to make sure the consistency of these personal characteristics.
Relationship with fans
The relationship between Korean idols and their fans can be characterized as "parasocial kin", which means to rather than simply admire or perfect Korean idols, fans more often at the same time create a familial connection with their idols, in some cases even between fans themselves. The one who facilitate this kind of relationship could be production companies or community of fans through various ways such as social networks services, fan sites, offline meetings in occasions like concerts or fan meetings etc.. The nature of this "parasocial kin" relationship can be seen in the proactive participation of Korean idol fans in production of idol groups. Fans have their own unique ways to show their attitude and opinion on issues concerning "unfair" actions of management companies, and under this situation they more often appear to be protecting idols from exploitation of companies due to the familial connection built between both sides.
Several Korean idol groups and solo artists have resented the contracts issued to them by their management companies, claiming that the decade-long contracts are "too long, too restrictive, and gave them almost none of the profits from their success". A director of South Korean entertainment agency DSP Media stated that the company does share profit with the performers, but often little is left over after paying costs. Korean entertainment companies such as S.M Entertainment have been called "factories" for their unique method of mass-producing stars. Members of groups are frequently retired and replaced with fresh trainees when their age or musical inclinations begin to pose a problem. Dong Bang Shin Gi charged S.M. Entertainment for unreasonable terms in their contracts with the company in 2009.
Entertainment companies in Korea use a boot-camp system in grooming their idols. In the case of S.M. Entertainment, the company receives 300,000 applicants in nine countries every year. They possess training facilities in the Gangnam district of Seoul, where recruits then train for years in anticipation of their debut. SM was called the first company to market "bands as brands", and commodify not just the artists' product, but the artist(s) themselves. Such techniques have resulted in mass recognition abroad and helped to spark the Korean Wave, which benefits entertainment companies by broadening their audience. As domestic fandom is not generally enough to produce the profits that these corporations and their players require, branding and marketing of the artist/group has become central to industry profits and thus a defining feature of the genre today.
According to the South Korean National Tax Service, the average annual earnings for a Korean idol in 2013 were KR₩46.74 million (USD$42,000). This was almost double the 2010 figure of KR₩26.97 million (USD$25,275), a rise attributable to the global spread of Hallyu in recent years.
Some of the highest-earning Korean idols, for example G-Dragon, receive multimillion-dollar annual incomes in album and concert sales. On June 25, 2015, SBS's "Midnight TV Entertainment" revealed that G-Dragon earned an annual KR₩790 million (USD$710,000) from songwriting royalties alone. Idols can also earn revenues from endorsements, merchandise, corporate sponsorship deals and commercials. According to The Korea Herald, once a K-pop music video attracts more than a million views, it will "generate a meaningful revenue big enough to dole out profits to members of a K-pop group."
Some idols have experienced extreme invasions of privacy from obsessive "fans" as a result of their career in the public eye. Alleged invasions of idols' private lives include stalking, hidden cameras in idols' dorms, fans attending personal events such as relatives' weddings, and physical assault.
There have been criticisms on the sexual objectification of female and male idols across the industry. The problem is exacerbated due to the higher rigidity of gender norms in contemporary Korean society. Korean idols are frequently depicted in music videos wearing revealing clothes and dancing provocatively, as part of the companies' effort to market idols in multiple ways.
- List of South Korean idol groups
- Fandom culture in South Korea
- Japanese idol
- Korean idols in advertising
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