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Rookie detective, Sahara Natsuki, is assigned to the Investigation Division of Ginza police station. Here he has an unexpected reunion with his father and veteran detective, Akimura Shimao, whom he has been estranged from since his parents' divorce. They find themselves unwilling partners, butting heads repeatedly. Over time, however, Natsuki learns more about how to be a good detective from his father and possibly how to let go of their past as well.

In a rapidly changing era, everyone is trying to explore themselves and find their true value. And what is the only thing that remains the same?

A day before the Korean War breaks out in 1950, a man is murdered. This event triggers repercussions in three families, as four young people struggle with love and forgiveness. Kim Eun Hee's father was falsely accused of the murder, and dies tragically as a result. Since then, Eun Hee has been shunned by her fellow villagers. Im Sung Jae has always been in love with Eun Hee, but the past threatens to tear them apart. Since his father's death, Sung Jae was ironically rescued and raised as a son by the real killer, Cha Seok Goo. Seok Goo's daughter, Cha Young Joo, is arrogant and smart, and has feelings for Sung Jae. Her jealousy drives her to try to break up his relationship with Eun Hee. Choi Jung Tae is also in love with Eun Hee, but he accepts that she cares for someone else.