Oden made his mind that he will join the army to reach the coordinates given on the map. That will be the safest way to go towards the border and into the jungle. He won't have to be worried about his safety.
He had planned to quietly leave them after he reached his destination. But Oden was more scared of something else's. Going towards the border of the yang empire means going closer to the Ye family.
Even if Oden isn't the one who experiences all the torture and cruelty of the Ye family. Deep down he was scared to go to that place again. They were the real monsters with human skin. He had made up his mind to take back revenge, but there is a lot of time for it. he needed to repair his dantians then get stronger.
In the meantime, Oden was thinking about making some quick cash. But that was too, risky. He has no power, his main body is somewhat alive, he has no support.