The Celestial Bride's Revenge

Astra, the Ninth Fairy, pulled out half her Celestial Bone to save Gavin Lowe. They married, Astra helped Gavin become top imperial scholar. He then planned to marry another. Weak after childbirth, he cut her open for their child, then threw her into a Deep Pool. Astra decides to take back everything from the Lowe family. Without Astra, Gavin suffers, kowtows to her idol for blessings. Gavin is horrified: the figure from the idol is the wife he drowned.