Henhai (Chinese: 恨海; pinyin: hènhǎi; Wade–Giles: Hen-hai) ("Sea of Woe" or "Sea of Regret") is a 1906 novel in 10 chapters by Wu Jianren (Wu Woyao). Set in the turmoil surrounding the Boxer Uprising of 1900, the plot involves two couples, whose arranged marriages cannot be completed. The husband-to-be of one couple dies from opium addiction, and his brother’s bride-to-be becomes a prostitute. The novel was one of the best sellers of the decade and is taken to be a response to foreign-inspired attacks on traditional Chinese marriage.