Jade Hides Pearls

As a concubine-born daughter of the Shen family, Shen Yun has always been overlooked. She grows up cautiously, keeping her head down, and at fifteen, all she hopes for is a kind stepmother who will find her a marriage that lets her become a proper wife in a respectable household. She does become a proper wife, but her husband is her own eldest legitimate brother.

After being reborn, Shen Yi learns the truth about his origins. The first thing he does isn't to claim his birthright, but to shelter the half-sister he's been thinking about for half his life.

1v1. The male lead is reborn, slightly obsessive, pseudo-siblings.

Theme: One person, one lifetime.