Fu Xinbo, Zhang Liang find Love in 1931

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Buddies Fu Xinbo, Zhang Liang pair up once more for upcoming Republican series 1931 Love Story 1931年的爱情. The series co-starring Han Chae-young, Li Xin’ai is still filming, and released a preliminary trailer last week.   Apparently Fu Xinbo plays a pair of brothers, but I can’t really figure out what the plot is from the trailer, anyone care to enlighten me?