The scandal within the K-pop industry has widened, with a third high-profile star quitting his band after admitting to viewing a secretly filmed sex video.

Yong Jun-hyung, 29, announced on Thursday that he would leave the boy band Highlight after he recanted his previous denials of receiving such videos.

Yong said he had received a clip that another entertainer had recorded without the woman’s consent and then participated in “inappropriate conversations” about it.

“All these behaviours were extremely unethical, and I was stupid,” he said in a message to his 1.7 million followers on Instagram.

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“I’ll leave Highlight since I realised the seriousness of the issue and don’t want it to bring further damage to my fans,” he added, according to a translation by South Korea’s Yonhap news agency.

Highlight’s entertainment label, Around US Entertainment, said in a statement that Yong was “now in a deep state of reflection for his past inappropriate actions, as well as for the disappointment that he undoubtedly caused many due to his immorality”.

The admission emerged on the same day that South Korean police were set to question two other K-pop stars over their roles in the scandal.

They include singer-songwriter and television personality Jung Joon-young, 30, who is at the centre of the filming allegations. Jung has already admitted to secretly filming women having sex with him and then sharing the video in a chat group that included other entertainers.

Jung, who cut short a trip to the US and quit showbusiness earlier this week, arrived at the the Seoul Metropolitan Police Agency for questioning on Thursday morning.

“I am very sorry to the public for causing concern,” Jung said as he entered the police station. “I will faithfully undergo investigation.”

Local media have reported that another industry figure who received the videos was Bigbang member Seungri, 29, who quit on Monday amid separate allegations that he procured prostitutes for business partners in return for investments.

Seungri – who has pledged to clear his name – was due to face police questioning later on Thursday.

The scandals have rocked K-pop, which has a global fan base and generates billions of dollars for the South Korean economy.

Within broader South Korean society, the use of hidden cameras to record sexually explicit material, known as molka, is a fast-growing problem. Police figures indicate the number of molka arrests rose from 1,110 in 2010 to more than 6,600 in 2014.

The revelations caused outrage within the country, with an association of female lawyers arguing the scandals give an insight into the widespread problem of women being treated as objects of sexual gratification and not as human beings.

Lee Suh-yoon, a writer for the The Korea Times, a daily newspaper, also suggested that “these recurring outbursts of gender-related crimes can no longer be attributed to ethical lapses of a few select individuals, meaning it’s time to point the finger at society, culture and an industry that overlooks and encourages such horrifying behaviour”.