Scarlet Heart

Episode 16 (1x16)

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When the Emperor assigns 4th prince to investigate the missing funds case, Yinzhen discovers that most proof are not in favor of Yintang the 9th prince. Yinzhen gave the evidence to 8th prince Yinsi so that he can warn Yintang about it. Unfortunately strong-headed Yintang didn't heed the caution, forcing both his brothers to report the truth.