As a popular tattoo artist in South Korea, Song Jaemin is fully booked weeks in advance and highly respected by his clients, some of whom come from abroad to see him.

But each time Song inks someone, he commits a crime since tattooing it is illegal without a medical license in South Korea.

“I began this even though I knew it was illegal, but I was confident that legal restrictions would be eased and things would change," Song, 28, told The Associated Press at his studio in Goyang near Seoul.

Song's prediction could soon become reality.

South Korea's National Assembly is expected to pass a landmark bill soon that would allow non-medical personnel to give tattoos.

The passing of the Tattooist Act would mark a victory for tens of thousands of tattooists in South Korea, who have used rallies, constitutional appeals and other means in their bid to nullify a decades-long ban on their work.

Their fight has gained strength as public sentiment toward tattoos has evolved.

In South Korea, tattoos in the past were associated with gangsters and criminals but have been gradually accepted as a form of self-expression.

Now, it's easy to find people from all walks of life with tattoos, including K-pop stars like BTS's Jungkook, TWICE's Chaeyoung and BigBang's G-Dragon.

Experts estimate millions of South Koreans have had tattoos, about 70% of them as semi-permanent cosmetic tattoos on their eyebrows, eyelines, lips or scalps.

Despite the widespread adoption of tattoos, South Korea still only officially allows licensed doctors to give them in line with a 1992 Supreme Court ruling that viewed tattooing as a medical treatment, citing potential health risks caused by tattoo needles and inks.

South Korea remains the only country in the developed world with such a regulation.

Tattoo artists face up to five years in prison and 50 million won ($35,740) in fines if they are caught inking people.

However, the government doesn't aggressively enforce these rules, allowing tattooists to thrive in the shadows.

A 2023 Health Ministry survey found that only 1.4% of respondents with personal tattoos and 6.8% of those with cosmetic tattoos said they were inked in hospitals.

“I think it’s nonsensical ... Lawmakers, entertainers and so many people around me have tattoos. But if it’s really illegal, am I a lawbreaker?” asked Kim Soyoung, 54, a customer at Kim Sho-yun's studio.

Song, who won a top prize in a 2023 domestic tattoo competition, said his clients include police officers, civil servants, soldiers and U.S. troops stationed in South Korea. He said some of his clients have traveled from China, the U.K., Malaysia and Iraq.

In recent years, judges have increasingly ruled in favor of tattoo artists or issued deferred rulings as a way to protect them, but some tattooists have been punished with fines. Lim Bo-ran, head of the Korea Tattoo Federation, said she urges tattoo artists to appeal such financial penalties to higher courts in a bid to step up their fight.

Tattoo artists fear that someone might report the illicit nature of their business to officials, forcing them to investigate. Some tattooists subsequently put up with customers behaving badly or run studios without signs. Some have also moved abroad for work.

Kim said she was “truly terrified” when a person close to her threatened to report her business to authorities and “destroy all I have" after they fought over something unrelated six years ago. She said the dispute was eventually resolved, but she still remembers the panic that seized her.

Lim said some female tattooists have suffered sexual assault but did not report it to authorities because they worried about losing their jobs.

The Tattooist Act, which would take effect following a two-year grace period, centers on the introduction of official licenses for tattoo artists. The process would require tattooists to take hygiene education courses at government-designated places every year.

Lim said the law would be a welcome development but that it would also burden tattoo artists by putting them under government supervision.

Song said he feels “tremendous pride" in putting his work on people's bodies that they will carry for their entire lives. He said meaningful tattoos at his studio have included works depicting clients' late loved ones.

“There is no limit in tattoos. Whatever you draw on paper, carbon paper, walls or elsewhere, we can also do the same on human bodies. There are really unlimited tattoo styles and artists,” Song said.

When AP journalists visited Song's studio, he was putting the final touches on a months-long work of the image of Jesus Christ on the forearm of Lee Byong-joo, 37, who already has many other tattoos.

AP video by Yong Ho Kim