Akatsuki no Yona episode 26

It aired on Friday, 19 August 2016.

The Yellow Dragon's (Zeno's) Past, Part 1: The Starting Dragon

This is the first of a two-part OVA surrounding Zeno's backstory which is not revealed in the main series. It starts out with the group having a drinking contest. Kija is quickly eliminated by Jae-ha as he wants to see who has the more powerful dragon limb.