Athanasia Cloix, a woman whose elegance and beauty is akin to that of a swan lake, was the Duke’s eldest daughter and the Queen of the social circles: an existence near to perfection. Due to some rumors, however, people began to misunderstand and belittle her. As she suffered through these unfortunate events, she learned to conceal her feelings by putting on a façade and agreed to a political marriage with the Winter-comer who's also known as the “Northern Monster”.

"As the Grand Duke, I will do my best to accommodate your needs and desires. But love alone is something I can't give to you." Unbeknownst to her, that very man will change her life and thus a new fate is about to unfold.

Yuer Le saved a mystery man from the deep sea, but she would never have thought that she would be dragged into a whirlpool of conspiracy... Best friend who went missing, dangerous investigator job, well-planned schemes, the bossy yet affectionate heir of the financial group, the quiet and gentle bodyguard, the proud gang childe, the mystery detective... It’s a story about trust and betrayal, conspiracy and truth, growth and love.