The words of god conveyed to Yona through the priest Ik-Soo are to find the four Dragon Warriors of Kouka Kingdom's Legend of the Four Dragons

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 blue dragon warrior, who experienced a voice telling him to protect Hiryuu when he touched Yona, while recognizing Ki-Ja as the white dragon, is dazed and escapes into the caves. Yona and Yun enter the caves, leaving Hak and Ki-Ja behind to deal with the villagers. They find the agitated blue dragon warrior, and Yona calmly asks him to be her ally. The blue dragon warrior tells her to leave, and they return to Ki-Ja who is holding back the hostile villagers. An earthquake traps the villagers with Yona, Ki-Ja and Yun. A villager explains the curse, until the blue dragon warrior enters. Out of fear, the villager strikes the blue dragon warrior, knocking off his mask.

The blue dragon warrior retrieves his mask and begins digging a path out of the cave. The others join him and Hak starts digging from the outside. Hak finally breaks through and reunites with Yona. Yona again asks the blue dragon warrior to travel with them and he accepts. They set off, but Ki-Ja collapses from exhaustion so they stop to make camp. Yona gives the name "Shin-Ah", which she says means moonlight, to the blue dragon warrior. When they awake the next morning, Ki-Ja tells Yona he can sense the green dragon warrior.