Kenzou Tenma, a Japanese brain surgeon in Germany, finds his life in utter turmoil after getting involved with a psychopath that was once a former patient.
In the early days of the Republic of China, a mysterious murder at sea draws Zhang Haiyan and his partner into an investigation that quickly spirals into a dangerous conspiracy. What begins as a search for truth aboard the massive ship Nan'an becomes a fight for survival in a world of intrigue and betrayal.
In Tokyo, police officer Mari Kouda and Chinese interpreter Ryo Arikino solve cases while bonding over meals from different cultures, forming an unexpected connection through their shared experiences.
After discovering a woman's remains hidden for sixteen years, Xu Weizhang unexpectedly establishes contact with police officer Liu Xinjian in 1995. Together, they investigate a serial murder case across two timelines.