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1592 – Joseon: In those days, it was common for the rich to hire the poor to do their hard and dangerous mandatory military duties. They were called ‘proxy soldiers’. A veteran proxy soldier TOW and his comrades are deployed...

The story is about an invisible/ghostly twin following her sister.

Under the overall theme of unrequited love and having a crush on someone unattainable, the drama tells stories of various happenings that can arise in such relationships. The stories are told in perspectives from both man and woman, as if it were written from an omniscient point-of-view, which allows viewers to sympathize with both sides and adds another layer to seemingly ordinary incidents between men and women.

Yukari Kawahara (Masami Nagasawa) works at a drink manufacturer. She works hard and achieves recognition for her work. Yukari Kawahara is dating research doctor Kippei Koide (Issei Takahashi). They have lived together for 5 years. One day, Kippei Koide collapses from a brain hemorrhage. Yukari Kawahara soon learns that everything she knew about her boyfriend was a lie. She hires private detective Takumi Kaibara (Kotaro Yoshida) to investigate Kippei Koide.