Novoland: Eagle Flag Episode 22

Ji Ye discovers Gui Chen and Yu Ran are married and, in his anger, tries but fails to escape. He encounters a familiar face from his past. Gui Chen visits Bi Cheng to learn more about the madness in his blood, realizing he's a demon that began killing at 16. He is injured fighting against the Bare Tooth soldiers while trying to kill Bi Cheng and is greeted by the Grand Princess, Emperor, and Wu Yi when he arrives at the Palace. (Source: frankly at MyDramaList)