A modern office drone who only wanted to lie flat transmigrates into the role of the principal mother and second wife in a marquis's household. She plans to coast through life, but two “little terrors” force her to get back on her feet. As they struggle against each other with wit and determination, they form a bond of affection that goes beyond blood ties. “I used to want nothing but to lie flat. Now... I can't lie flat anymore, but it doesn't seem so bad.”