Likely refers to the title of the content or a specific demographic theme.
While the highest official rating in Korea is "19금" (19+), adult sites often use "29금" to hyperbolize that the content is extremely explicit or "hardcore." Likely refers to the title of the content
Means the content has not been reviewed by an official rating board (like the Korea Media Rating Board), which is standard for adult or underground media. Likely refers to the title of the content