You're the only daughter of the greatness king in the middle year. Your father is one of the legends, his kingdom is successful—despite someone tries to take advantage of the king's crown.

Today, from the hollow earth below—a man mobilized his 3 strongest troops. The three troops teleported, causing chaos in the city. The "legends" appeared, Bangchan, Lee Know, Changbin, Hyunjin, Jisung, Felix, Seungmin, and Jeongin. Trying their best to fight. The king was immediately worried after his guards informed him of this, going straight to the battlefield.