After revealing information about his late sister's personal life and mentioning names of colleagues in the entertainment industry, Sulli's older brother faced criticism from the public. On April 2, he took to social media to identify some of his sister's fellow industry members, including Kim Soo Hyun, Lee Sa Rang (also known as Lee Ro Be), YouTuber Lee Jin Ho, and Kim Sae Ron’s former manager.

He shared that Kim Soo Hyun, Lee Sa Rang, YouTuber Lee Jin Ho, and Kim Sae Ron’s former manager were implicated in the situation, while also alluding to other stars. Connecting IU to the matter, he mentioned that she had a connection with Kim Soo Hyun, declined the lead role in 'Real,' and then introduced the script to Sulli. He made references to the late Goo Hara and Kim Sae Ron after talking about Sulli.

During a live broadcast, he also mentioned Sulli's previous relationship with P.O. before dating Choiza, her ex-boyfriend. P.O.’s agency, Artist Company, responded by stating that it was a personal issue and could not confirm anything.

In reaction to the brother's disclosures, some netizens expressed their support for Sulli, questioning the motives behind the revelations. They raised concerns about the impact on Sulli's reputation posthumously and whether such revelations were in alignment with her wishes.