Huangfu Huazhang is quite frank: "It was me."
From behind, Tang Yan Yi's facial expression is not visible, but both Shi Nian and Tang Yanqing can see her head slightly tilting up 45° to the left, indicating she must be smiling now.
Tang Yan Yi then asks, "Then please explain to me, what were you doing that night?"
Huangfu Huazhang slightly raises his eyebrows, a hint of bewilderment and innocence flashing in his eyes: "But I need to know first why Madam Tang suddenly asks me this. The original footage should have a timestamp, but Madam Tang erased it and doesn't let me see, so I really can't recall precisely which day it was. Hmm, it should have been a long time ago."
Huangfu Huazhang's request is reasonable, so Tang Yan Yi has to explain: "This was captured by a surveillance camera near Rosa's accident location, approximately a month prior to the accident, around the days of September 9th."