Sorry for grammar mistakes
Junoh is def not going out with Minoh on a whim or going with the flow. We've seen his jealousy and how conscious he has been of Minoh. It's more of a loss to Junoh because Jae hee has been a very special existence to him since he was a kid. Surely he liked Jaehee, but he was hurt greatly too and he even got mad at Jaehee but couldn't express it since he also fainted.
Re-appearing in his life yet again just made those emotions resurface, which led Junoh to become depressed. I strongly believe it was a trigger, remember that scary face he made in the car?
My point is, Junoh truly does like Minoh, if you read it in one go I believe it changes perspective a little.
Even if I feel extremely sad about Junoh not feeling , this is how I see it, the same way about Minoh and got a little bit angry because he accepted Minoh's feelings without understanding his own feelings for another guy ..
Part of me think it's not right to get angry at him because until we only saw the story through Minoh's eyes, so even the Junoh we got to know was mostly the one Minoh saw. Besides because Minoh is such a puppy in love, a lot of the actions Junoh did came out to feel like the one of an angel...
I'm still a little bit dissapointed? Don't know how to express this emotion, but it's like Minoh's love since the beginning made me think that after they started to dating everything was going to be rainbows and flowers.