Late, but here it is! New information is coming out constantly, so we'll do our best to keep this updated but may miss some stuff. Please comment below if there's something that you'd like added to the megathread.

Why the wave of allegations?

The sudden influx of bullying allegations towards idols and other celebrities in South Korea was sparked by high profile allegations of bullying in the pro volleyball world, which lead to the removal of the twins Lee Da-young and Lee Jae-young from the league. This is not an isolated incident; there have been a number of other bullying and abuse scandals in the Korean pro sports scene. This particular news, however, has been compared by some to the MeToo movement in the US because of the way it has sparked more allegations and greater conversation.

School bullying allegations (Idols):

• Aisha (EVERGLOW) - Former middle school classmate claims she was verbally and physical abused, and that Aisha spread sexual rumors about her. Yuehua Ent. is denying the claim and says that Aisha does not know the accuser, and they will be seeking legal action if allegations continue.
• Chuu (LOONA) - Accuser has retracted their bullying claim and apologized. It seems that BlockBerry will still be seeking legal action.
• HyunA - 5th grade classmate claims to have been physically assaulted. HyunA has responded with a message denying the accusation and details the hardships she went through as a child star. P NATION supports HyunA's statement.
• Hyunjin (Stray Kids) - Previously accused of bullying in 2018, Hyunjin has been accused again by an anonymous netizen. Hyunjin's activities have been suspended while JYPE investigates. He has released an apology and has apparently met with the alleged victim in question. Another classmate has come forward to defend Hyunjin, saying that he was the victim of false accusations.
• Khael (MIRAE, upcoming DSP boy group) -Netizens have brought up a previous allegation of bullying against Khael made in 2019 by two middle school classmates.
• Kihyun (MONSTA X) - Former middle school classmate accused Kihyun of bullying, including verbal and physical abuse, and spreading rumors, along with drinking and smoking. Kihyun has released an apology. Starship Ent. says that they have investigated previous claims from the same classmate in the past and found them to be false.
• Mingyu (SEVENTEEN) - A former classmate claims Mingyu was part of a group of bullies and made jokes with which she was uncomfortable. Pledis Ent. denies the claims and cites inconsistencies from the alleged victim's accusations. More posters have come forward with bullying allegations, one of which additionally accuses him of sexual harassment.
  • UPDATE: Pledis has released a statement saying that the original poster and Mingyu have settled their disagreements.
• Sohye (I.O.I) - Previously accused of bullying in 2017. A classmate states that they witnessed incidents of bullying by Sohye.
• Soojin ((G)I-DLE) - A poster claims that her younger sister was bullied and also claims that Soojin stole, smoked, and drank (and other various accusations). Another classmate has come forward to state that Soojin additionally bullied the actress Seo Shin Ae. Cube Ent. denies the accusations of bullying/violence, and Soojin has released a statement clarifying her view of what happened, denying the bullying, violence, and stealing.
  • UPDATE: Soojin is halting all activities for now. Cube requested to meet face-to-face, but was denied by the alleged victim.
  • UPDATE 2: Cube and Soojin have released statements following several developments including the addition of more accusers. Soojin's detailed statement addresses 10 claims of school violence, and gives her own perspective of what really happened. Cube has conducted their own investigation and will be seeking legal action against the accusers. Soojin states that if she is found guilty of school violence, she will leave the group.
• Soyeon ((G)I-DLE) - A person claiming to be a former middle school classmate accuses Soyeon of bullying. These claims have not been addressed by Soyeon or Cube.
• Sunwoo (THE BOYZ) - A poster accused Sunwoo of abusing his middle school girlfriend along with drinking, smoking, and other things. Cre.Ker Ent. denies the claims and will be seeking legal action.
• Woonggi (TOO) - A poster claims that Woonggi and his friends were bullies, and that their school was made aware of this but did not investigate. Stone Music that he did not get along with some classmates but was never violent.

School bullying allegations (Actors):

• Choi Ye Bin - Accused by a netizen claiming to be a middle school classmate. The post has since been deleted, and her agency is not seeking legal action.
• Dong Ha - Agency denies accusations of school violence in high school.
  • UPDATE: Dong Ha's agency is seeking legal action. However, the poster continues to stand by their claims.
• Ji Soo - (CONTENT WARNING for these sources. These articles are extremely disturbing beyond the level of the other articles included in this megathread) Three posters claimed to be victims of severe school violence, which his agency denies. He has now been accused of sexual assault in addition.
  • UPDATE: Ji Soo has released an apology. He has been removed from the drama River Where the Moon Rises, and they are trying to work out what they will do with the episodes they have already filmed. It seems that some Korean streaming/on-demand services have removed some of his dramas from their services.
  • UPDATE 2: All activities are currently halted and his agency Keyeast denies the sexual assualt claims. He will be enlisting in October after having received his notice in December 2020. Due to a prior medical condition, he will be serving as a social worker.
• Jo Byeong Gyu - Accuser of school violence has retracted their claim and apologized. Was previously accused of bullying in 2018.
  • UPDATE: Two more accusers have come forward. A former classmate uploaded a post defending Jo Byeong Gyu.
• Jo Han Sun - Accused of bullying in middle school. Agency denies the claim, and three netizens claiming to personally know Jo Han Sun have posted in his defence.
• Kim Dong Hee - Multiple netizens have come forward with accusations of violence and smoking. NPIO Ent. denies the claims and will be taking legal action. The premiere of her drama Dear.M has been postponed.
• Park Hye Su - Two people have accused the actress of school violence. Her agency has denied the claims, and Dispatch has released supposed evidence that the accusations are false.
  • UPDATE: Park Hye Su is now claiming that she was the one who was the victim of bullying.
• Shim Eun Woo - Accused of middle school bullying. The agency states that although she did not have a good relationship with the alleged victim, she was not a bully. The older sister of the alleged victim supports the bullying accusations.

Other allegations:

• Hyunjoo (APRIL) - Hyunjoo's brother claims that she left the group due to bullying from the other members and has released images of medical records from an apparent suicide attempt. A friend followed up to add more details and state that all members were involved, including current KARD member Somin. Yoonjo of UNI.T and Hello Venus has spoken out in support of Hyunjoo, along with Lee Suji of UNI.T and the Ark. Hyunjoo and her mother met with DSP Media to confirm the bullying accusations. DSP Media denies the claims and will be suing Hyunjoo's family and any friends who back her up. Former A-JAX (ex-group from DSP) member Yoonyoung claims that Hyunjoo the accusations are false, as does member Yena's sister, APRIL's former hairstylist, and current makeup artist.
  • UPDATE: A netizen is claiming that she was a former classmate of member Jinsol and that her alleged behavior towards Hyunjoo is a continuation of similar behavior in childhood. Member Naeun has now been dropped from all of her advertising campaigns. She is also dropping out of her drama, "Taxi Driver."
• Seunghee (OH MY GIRL) - WM Ent. is taking legal action against singer/producer TANK (not the R&B artist) for harassment and threats after she denied advances of a romantic and/or sexual nature.

Further reading:

r/kpop Megathread

Mingyu megathread

r/KDRAMA school violence megathread