‘아는 형님’ 한석준, 고대 재학시절 직접 목격한 서장훈 충격 장면은? In "Knowing Bros", what was the shocking scene of Seo

In "Knowing Bros", what was the shocking scene of Seo Jang-hoon that Han Seok-joon witnessed when he was a student at Korea University? ‘아는 형님’ 한석준, 고대 재학시절 직접 목격한 서장훈 충격 장면은?