The king probably doesn't know Louie is his son, judging by his reaction in the ending. If he shares Louie's recklessness, the high priestess might've purposely hidden it from him; if he knew, he might "do the right thing," acknowledge Louie as his son, and send the kingdom into turmoil.
- First and foremost, Jenny is the Head Priestess of the Mylee Shrine which means, in all likelihood, she's still a virgin. The manga also makes it clear that she was only teasing Melissa about a servant of Mylee possibly being called on to sleep with her champion (note Jenny's expression in the bottom-left panel).
- Second, in the manga version, while she mentions Rijarl was a womanizer who often cheated on his wife, Queen Meledi, Jenny never even vaguely implies that she ever slept with him, herself.
- Also note that when she learns that Louie is Melissa's "champion", in her internal monologue, Jenny referred to him as "that Louie", rather than "her Louie", as a mother usually would when speaking of their son.
- Odds are, Louie is Rijarl's illegitimate son by one of his many consorts, but it's unlikely that we'll ever know who Louie's mother is, because Rijarl couldn't keep it in his pants.
- The possibility of Jenny being his mother is Jossed - see previous WMG
During the Mylee Festival, Louie notices a painting of her alongside Headmaster Carwes and remarks that she never told him that the two of them fought together in the war. She responds by smiling secretly and saying that she and headmaster Carwes are "quite close." It seems strange that both she and Headmaster Carwes would have neglected to tell Louie such an interesting piece of information, especially since Louie is both interested in and knowledgeable about the battle. They seem to be actively hiding the extent of their relationship; there must be a reason.
Headmaster Carwes's concern for Louie is understandable, as he is Louie's foster father; but watch his face at the end of the last episode when he begs the king not to "punish my son." We also know that Carwes was a beefy guy in his younger days - see the aforementioned painting.