Following Zuko's crown ceremony, seventeen year-old Zuko asks Aang to promise to kill him if he ever becomes like his father. Aang reluctantly agrees. One year later, Zuko is working with the other nations to return captured colonial lands to the Earth Kingdom as part of the Harmony Restoration Movement. Kori Morishita attempts to assassinate Zuko in retaliation for forcibly relocating the multicultural residents of the Fire Nation colonies. Zuko travels to Kori's hometown, Yu Dao, where he meets people of Fire Nation and Earth Kingdom ancestry living and working together. Zuko becomes conflicted and consults with the imprisoned Ozai, who advises Zuko that whatever decision he makes is inherently the correct choice because he exercises the power of the Fire Lord. Zuko decides to break from the Harmony Restoration Movement. The Earth King responds with a military force of his own and Zuko is forced to lead troops to Yu Dao to protect the Fire Nation civilians. In the battle, Aang and Zuko clash. However, Katara convinces the Earth King that the colonies are neither Fire Nation nor Earth Kingdom, but rather a multicultural people. Peace is restored, and Zuko realizes that forcing Aang to make the promise was a way of distancing himself from his responsibilities as Fire Lord. He releases Aang from the promise, and the two reestablish their friendship and trust.