[1] On 31 July 2015, Mziu agreed personal terms and signed a one-year contract Korabi Peshkopi in the Albanian First Division.
[7] He began his second season with the club by playing in the first half of the opening match of 2016–17 Albanian Superliga against Laçi which ended in a goalless draw at Elbasan Arena.
[15] Mziu proved to be an important instrument in Samuel Nikaj's team as he played 25 league matches and scored twice to help Kastrioti top Group A which meant the return to Albanian Superliga after four years.
[16] In the final championship match against Group B winners Tirana, Mziu played full-90 minutes but didn't avoided the 2–0 loss at Elbasan Arena.
[18] He began the season on 18 August by netting a penalty kick in the 1–0 win at Luftëtari Gjirokastër in the opening week of 2018–19 Albanian Superliga.