The clues are foggy: Liu Wenyan claimed that he was in his study at the time of the crime, and a servant testified; Zhou Miaoniang had an alibi, but deliberately concealed the conflict with Su Yuniang in her words; the source of the incense ash points to the "Wan'an Incense Shop" in Bianjing, but the shop owner said that no large-scale incense has been sold recently.
