The Things the Sea Returned

Sellakia Lensch, from a humble Viscount family, was strategically married to the Young Master Tenus Seidon out of necessity.
However, she soon realizes that the Seidon Ducal family is not where she belongs. Despite the continuous cold treatment, she lives a life of mere compliance until she loses her memory of the last seven days right before an accident disguised as an assassination attempt…
She lies to Tenus, who finds her after she was reported missing, claiming she has completely lost her memory. To free herself from the Ducal family and Tenus Seidon.
“But I don’t remember marrying you. I told you, I lost my memory.”
“Just because you don’t remember doesn’t mean our marriage never happened, Madame.”
Yet, for some reason, Tenus doesn’t easily accept this.
*
“It’s all because of you that he targeted me. I’ll resent you for the rest of my life.”
“Do so. By my side.”
“I won’t cooperate with you at all as the Duchess.”
“I’ll have to watch. From up close.”
“…I’ll lead a debauched life, squander the Ducal family’s wealth, and tarnish its fine reputation.”
“I’ll cheer you on from beside you.”
But you… Are you worried about me?