The latest episode aired half day ago and it was officially the last filler before the series finally head to the climax.
Although even though was just a distraction of episode with bad artist behind it (thank goddess that joker won't ruin more episodes with their lazy artstyle) it already gave some emphasis about the bad omen about to happen.

Offmon's human partner, Yuujin, ever since day 1 showed very fishy occasional behaviors. Which is sad, he's such a good, thoughtful, kind and friendly kid. It is no wonder no one ever suspected him, except the mister edgelord Rei cuz he has revealed to have scanned him in some point, learning his past was all written up.
There's no way to tell exactly what Yuujin is yet, except he's for sure, not a normal human.

And the answers will come out next episode. I mean it's titled "The truth behind Yuujin"
We don't know if he's a willing traitor or being controlled somehow.
Whatever it is, is not a good thing. Bonds will crumble.

That's where the question goes: what will happen to Offmon?
It's no secret Offmon holds Yuujin with great regards and is constantly close to him, sitting on his shoulders and holding him all the time. He trusts him completely and is thankful he did manage to keep his savage nature as Shutmon under control for being accepted despite his personal problems. Yuujin constantly supports him and treats him like a little baby brother so it's sad to think that's about to end.