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A story about a girl who's half human and half mermaid.

Elio, a country count's daughter, gets caught up in her father's scheming plot to seduce a young duke. Without even laying a finger on him, she overnight becomes a "trashy young lady" who allegedly assaulted the imperial princess's fiancé. However, instead of setting the record straight, the young duke fans the flames of the scandal. To help Elio escape her abusive father, he proposes a deal: pretend to be his fiancée for three months. Thus begins their fake engagement. The only problem is that she keeps getting shaken, as if it were all real.

After her husband's sudden death, she became a widow and the head of a noble family. Her stepson, cheerful and supportive, takes her side, while her older daughter-in-law, who dislikes her, warns, "Please maintain proper decorum." Amidst this brewing mother-in-law vs. daughter-in-law drama, she uses her past life experience as a tutor to open a counseling service for troubled souls. A modern-day noble family conflict with a twist: free counseling sessions! (No appearance fees.)