Yoo Ah In is suspected of using a third drug on top of marijuana and propofol.

On February 24, MBC's News Desk reported that "There were three types of drug ingredients detected through the actor's hair that was tested through the National Institute of Scientific Investigation. There was another type of drug that was detected in addition to propofol, which the actor was suspected of first and marijuana."

The police conducted a search and seizure of Yoo Ah In's hair and urine when the actor entered Korea through the Incheon International Airport on February 5. The police reported that Yoo Ah In tested positive for marijuana through his urine test but did not test positive for propofol at that time.

However, through the detailed analysis of his hair sample by the National Institute of Scientific Investigation, Yoo Ah In also tested positive for propofol. 

Regarding the reports that there was a third drug substance detected along with hemp and propofol, Yoo Ah In's agency UAA stated, "We have inquired the police several times about the reports that were made about the third drug substance. However, we only received the answer 'We can not tell you'. We ask for your understanding that we cannot arbitrarily reveal our position based only on media reports in the absence of any official information from the police."

Additionally, the agency stated, "We have not received any information regarding the future investigation schedule but we will faithfully cooperate and receive investigation as soon as the schedule was set."

Previously, investigations found that Yoo Ah In had been prescribing propofol at 10 hospitals and clinics in Seocho-gu, Gangnam, and was accused of habitually using propofol since 2021.