I think this moment might end up in my top three of the series.
Like him or not, every action Jun has done in the story has been for love or protection of someone else.
When he encouraged the rift in the group, it was because he’d seen Thame destroying himself to keep them together, and he saw Korea as Thame’s only escape route, even if Thame himself didn’t want to take it.
When Jun was pursuing Po, it was because he believed Thame wasn’t interested, and when Jun found out Thame was, he still pushed a bit just to make sure Thame was serious, to protect Po. Because Jun knew what Po had gone through with Earn—whether that was something Po told him himself or something Jun found out on his own somehow. When he saw how earnestly Thame felt for Po, he stepped back even though it hurt him because he knew Po had always wanted Thame.
In many ways, Jun appears to have the kind of cutthroat attitude that would make him thrive in the entertainment industry. But we see over and over that what he’s truly cutthroat about is love. He loves Thame, he grew to love Po, and he loves his group.
And when Jun realized that there was no immediate way out of their situation in that hallway, he went to the member whose world was most in jeopardy: Nano. The one who’d been most reluctant to come back because he had the most to lose.
And it would have been so easy to show Jun going offscreen like Dylan and Pepper, but instead we see him quietly cover Nano with his own body, even if he can’t do or say anything else. Because Nano agreed to the risk, part of that choice meant gaining back his found family.
So while Dylan rages, Pepper freezes up, and Thame melts down, Jun is the only one left to take care of the youngest, and so he does.