Zeno! Who else!
I think that he is an intriguing character, who seems to have his own agenda. He loves the people around him, but it is pretty much inconceivable that he accepts the gods choices without ever feeling any kind of anger upon his fate. ...I just wonder why he doubted Yona at the beginning. If he knew that she was King Hiryuu s reincarnation...He is a person with many different conflictive traits.
His last request really let me hope that finally more will be revealed about him, Soo Won and the prophecy.