The Abyss Episode 16

Jiang Yan confronts her brother Jiang Xiao, revealing her long history of manipulation and confirming he has evidence against her. After Jiang Xiao refuses to yield, Jiang Yan confesses to killing his mother and then murders him. Meanwhile, Ning Zhen fights the masked Shen Yuan ("Abyss") but fails to capture him. Ning Zhen deduces Jiang Yan killed Jiang Xiao, not Shen Yuan. Jiang Yan creates a diversion using Mo Bei and races to a nursing home, finding the evidence (on a laptop/USB drive) hidden via her father's account. Ning Zhen and Lu Fan intercept her, but during a struggle, the USB drive containing the evidence is destroyed in a fire. Due to a lack of proof and a formal complaint, Ning Zhen and Lu Fan are suspended, but they vow to continue investigating. (Source: tvrili.com)