Lee Hyun-woo reflected on Sung Si-kyung’s younger days in a video posted to Sung’s YouTube channel on October 13. Lee Chang-sub was also featured. When Sung asked whether he had seemed unusually at ease with senior colleagues, Lee said he had, but added that Sung’s consistent manner had not offended him.

Sung explained that both he and his father were the youngest in their families and that he had grown used to addressing older cousins informally. He asked whether he had been too comfortable around Lee, whom he admired. Lee said no and described Sung as a warm junior colleague.