Nguyen Trung Quan, the main character of Mighty Guardian Lost Avian, is a young tourism student who unintentionally gets caught up in an unbelievable battle between humans and ancient monsters. After a fateful event at the Tản Viên mountain relic, Quan discovers that he is the chosen one to inherit legendary powers from the era of the Hung Kings. This is a coming-of-age journey of a young man, from an ordinary student to becoming the Mighty Guardian Lost Avian, a symbol of hope and strength against the darkness.