“We'll go anywhere as long as it means you'll live.” As Yona is dazed by the suddenly rebellion at the castle, Hak runs to her rescue. Also known as the “Thunder Beast of Kouka Kingdom”, Hak protects Yona, and with a single lightning-quick strike from his blade, he dispatches the mercenaries attacking them on after another.

Hak is accused of murdering King Il. In order to protect Yona and the Wind Village, he gives up his title of chief and decides to wander alone.

In their search for the Blue Dragon, Yona and her friends visit a hidden village carved from stone. Though Ki-Ja insists the Blue Dragon is there, the villagers claim there is no Blue Dragon.

The war game is held. The participants are divided into teams with Su-won and General Geun-tae leading the white and red teams respectively. The objective: to score the most points by breaking the plates of the other team. Su-won's strategies and hidden ferocity impress Geun-tae, whose team manages to win more points than the white team despite all their plates being broken. Su-won leaves the city with his cohorts, having stimulated demand for Geun-tae's wife's tea in a neighboring land, re-invigorated production in the earth tribe's mines, and inspired the earth tribe's people anew of their leader's strength.

"Why? Why am I so afraid? She's just a little girl..." While suffering injuries, Yona and Yun successfully complete their task, and Jeaha rushes to their aid to fight against hordes of attacking mercenaries. Watching Jeaha fights, Yun realizes how truly amazing those who possess the strength of the dragons are. Sinha joins the fray, and the mercenaries continue to fall. Meanwhile, Hak and Gija remain behind to fight with the pirates, overwhelming their enemies with extraordinary strength. Realizing he is at a disadvantage, Kumji tries to flee so he can recuperate...

"Miss, what do you want to do with the Four Dragons?" Yona and her companions continue their journey to find the fourth and final "Yellow Dragon" when they encounter a traveler named Jeno. He is the "Yellow Dragon" they have been seraching for.