
I mean, Yun Oh is right though. Haewon doesn't love Yun Oh romantically and that's why Yun Oh is insecure. They aren't on the same level.
Its like Yun Oh has Haewon's body but not his heart. Sure, he has him, but not in the way Yun Oh idealized it to be. So that's why he's acting all wishy washy and flip flopping so much. Haewon is going through the motions but the one thing Yun On wants is for Haewon to love him just like how he does with Haewon.