The National Forensic Service concluded that the cause of Lee Jae-gyeom's son's death was "cause unknown" after an autopsy found no abnormalities.

Lee Jae-gyeom's son received his first Pfizer vaccine dose on September 7, 2021, and his second dose on October 17, 2021.

119 paramedics observed blue congestion on both sides of Lee Jae-gyeom's son's neck, which they stated often occurs during cardiac arrest.

Lee Jae-gyeom's son was working at Lotte Hotel Jamsil, having been recommended by his academic advisor.