Harbin Under the Nightfall, Episode 4, Watch Online. Plot Introduction of Harbin Under the Nightfall, Episode 4: Wang Yimin disguises himself as a patient to scout the hospital, but is recognized by Lu Qiuying. Lu Qiuying warns Wang Yimin that the assassination is no different from suicide. In order to prevent Feng Zhi from destroying the organization again, Wang Yimin finds Feng Zhi's ward and shoots at the bed, only to discover that he has fallen into a trap and is captured alive.