Dark Night and Dawn Episode 7

Jin Yan's father becomes the prime suspect in the murder. Lin Shao Bai hides an important piece of evidence found at the murder scene. Lu Zheng Yang refuses Lin Shao Bai's help in solving the case, so he investigates the case on his own. Lin Shao Bai finds the real murder suspect and connects him to the explosion case four years ago. Lin Shao Bai wants to join the case as a police officer, but Lu Zheng Yang suspects he is joining for other motives. (Source: jindreame at MyDramaList)