The Last Empress Season 1 Episode 2

After saving the Emperor’s life, Sunny safely returns home. The assailant is apprehended, and the Emperor and the Empress Dowager learn that he is the brother of Kang Joon Sung, an Imperial guard who went missing seven years ago. Mysteriously, the assailant dies of a heart attack during the interrogation. Meanwhile, Yu Ra tells her mother that she wants nothing to do with her and her family.