2021–2023: Bullying accusations, military enlistment and hiatus
In 2021, Ji Soo was reported to play the male lead in the Korean drama River Where the Moon Rises. The drama began airing on 15 February 2021 with the actor playing the role of On Dal. He starred in the drama for six aired episodes until reported school bullying and assault accusations were made against him. Following this, KBS replaced Ji Soo and he was from then on removed from the show. The role of On Dal was re-cast by actor Na In Woo, who appeared in the drama from episode nine onward.
Actor Ji Soo was announced to be enlisted for mandatory military service duties in October 2021. Reports said that he received a mandatory military service duties summon in December 2020. After completing four weeks of basic military training, he was announced to carry out the rest of his services in the assigned social worker department.
On 6 July 2021, the legal representative of Ji Soo, law company Shin & Kim, released a new statement regarding the open-ended legal procedures of previously-reported school bullying and assault allegations. In May 2021, the same representative had stated that the actor had decided to take legal action against the people who had made false accusations and spread false rumors.
"In March 2021, there were many blatant lies posted on the Internet including those accusing our client of sexual offense allegations. The man who wrote a post accusing our client has sexually assaulted his wife in the past has come forward and apologized, but the rest of the accusatory posts made their way around the web without any verification. Thus, our client has decided to take legal action against the circulators of false information to reveal the truth.
Recently, we were able to locate one of the writers of false accusatory posts thanks to search and seizure on IP addresses and more. The man turned out to be a soldier who recently enlisted. He admitted that everything he claimed in his post was false. He then sincerely apologized to our client with a handwritten letter and plead for his forgiveness given that his mother is currently battling cancer.
Our client has dropped the aforementioned man from the lawsuit after considering both his and the perpetrator's circumstances. However, most publishers are laying low after deleting their false accusatory posts. We will take strict legal action against these people.
Meanwhile, the posts accusing him of school bullying were mostly untrue as well. Our client has sued them for libel. We are writing to notify the search warrant has been issued by the court and the investigations pertaining to the case is underway."
On 27 May 2021, KeyEast announced that Ji Soo's exclusive contract with the agency has been terminated due to the controversy.