My Wife-Lord Has a Split Personality (Women Rule)

Incomplete blurb. I'll rewrite it when I have time.

[The sisters are both female leads. The female lead has a split personality.]

When she came of age to marry, Lan Yu followed her elders' arrangements and married up into the century-old He family.

His wife was the He family's eldest daughter. She was not only strikingly beautiful, but also composed and gentle, and treated him with great consideration after they married.

Apart from his wife's demanding work, which kept them apart more often than not, Lan Yu felt there was nothing else to complain about.

Until one day, he saw a familiar figure in a derelict courtyard and thought his wife had returned. But the servants told him it was the second young lady of the household, his wife's twin sister. She looked exactly like his wife, except for a black mole at the corner of her eye.

Though they were sisters bound by blood, the elder sister had risen to a high position at a young age. Many admired her as a noble and upright gentleman, and she had married a gentle, virtuous husband.

The younger sister, by contrast, could only remain hidden in the secluded courtyard, kept out of sight. Jealous of her sister, she seduced her naive brother-in-law.

-

Lan Yu wanted to tell his wife.

"I owe my younger sister a great deal. Please be patient with her and take care of her for me."

Until one day, he found traces of himself, left on his wife by her sister.

Theme: The day will come when we ride the wind and cleave the waves, raising our cloud sails to cross the vast sea