Third brother of Si Yueting, a neurosurgeon and authority in his field. He wears a cold white lab coat and silver-framed glasses. He is engaged to Jiang Mingyan but is being manipulated by Shen Mengyu. He initially looks down on Yan Zheng as a country bumpkin mute with elementary school education but is shocked by her inner thoughts cursing him. He is described as having a lax upbringing.
