Sasaeng: The K-pop Word for Fans Who Cross Into Idols' Private Lives

On Jan. 22, 2024, Kim Jae-joong posted an Instagram photo of private taxis his sasaeng fans had hired to follow him, and he then decided to take legal action against them, the Asia News Network reported. A sasaeng is an obsessive fan who invades the private life of a Korean idol, drama actor or other entertainment figure, as Wikipedia defines it.

Most K-pop slang is playful. This word is not. It names behavior that can frighten idols and their families, break the law and push agencies to court.

What it means

The full form is sasaeng fan. Wikipedia gives the Korean as , the Hanja as 私生 and the Revised Romanization as sasaengpaen. Fans writing in English usually shorten it to "sasaeng," and the plural is "sasaengs."

The meaning sits right in the word. Wikipedia explains that sa (; 私) means "private" and saeng (; 生) means "life," pointing to the way these fans push into celebrities' private lives.

Stalking is one of the most notable activities tied to sasaeng fans, Wikipedia notes. The same entry lists other acts associated with them:

• Tracking celebrities down at their dorms or homes.
• Spreading rumors.
• Stealing personal belongings or personal information.
• Harassing family members.
• Sending idols gifts such as lingerie.

The word has no affectionate or ironic shade. Dictionary.com's guide to K-pop slang describes sasaengs as a group widely looked down upon, and the Asia News Network calls it industry slang for fans who invade an artist's private life, often with problematic and obsessive behavior.

Some sasaengs work in public. Dictionary.com wrote that they tend to run fan pages, and that some people compare them to the American tabloids of the 2000s.

Where it came from

The word comes from Korean, built from sa for "private" and saeng for "life," according to both Wikipedia and Dictionary.com. None of the dictionaries and explainers consulted for this entry says when or where the term was first used, so the exact origin is unknown here.

Its spread in English is easier to trace. Dictionary.com said the slang in its April 28, 2022 guide is used mainly by English-speaking international fans and turns up on fan Twitter, Instagram, TikTok and Tumblr. The word has also reached general explainers: wikiHow, in an article last updated Oct. 24, 2025, cites K-pop idol and performer Viankha Jesslyn defining a sasaeng as an obsessed fan of a K-pop idol.

In the headlines

Feb. 1, 2024: Kim Jae-joong and the industry push. Along with the taxi photo, the Asia News Network reported that Kim has been followed by obsessive fans ever since he debuted with TVXQ in December 2003. The same report said BTS members have received deliveries and letters at their homes, some homes were broken into, and Big Hit Music filed criminal complaints over stalking and home invasion.

The report also described two incidents involving NCT. A fan entered the home of Haechan and his family in November 2022, and a fan broke into Jaehyun's hotel room during the group's U.S. tour in October 2022. Industry sources quoted in the piece said sasaeng fans need heavier punishment because current penalties do not deter them.

Nov. 2, 2023: Kim Taehyung. A Medium post by hana ayu said police arrested a woman in her 30s on Oct. 26, 2023, for allegedly following the BTS member from his apartment while trying to hand him a marriage proposal letter in the elevator. The post said Taehyung told fans on Weverse that he was okay.

July 16, 2021: SM Entertainment draws a line. NME reported that SM Entertainment issued a public statement promising stricter action against sasaeng fans. The agency said sasaeng fans had stalked idols at military service sites and private homes and sent anonymous packages to their homes. SM said it had collected blackbox footage, video recordings and communication records and would pursue every available civil and criminal remedy, citing a newly enacted law with heavier penalties for stalkers.

How to use it (and how not to)

Fans use the word to name and call out behavior, never to praise it:

• "Someone posted the dorm address again. That's sasaeng behavior, report it and don't share it."
• "Waiting outside his family's house isn't love. That's what sasaengs do."
• "I'm a huge fan, not a sasaeng. I don't need to know where he lives."

The etiquette is simple. This is not a friendly or joking label. Dictionary.com notes that sasaengs are widely looked down upon, and the acts the word describes, such as stalking, break-ins and harassing families, can be crimes. Don't use it to tease a friend for being enthusiastic, and don't toss it at someone without cause, because calling a person a sasaeng accuses them of stalking.