beta
It would have been a disaster if due to that misunderstanding, he somehow fell in love with someone else during those 4 long years.
Then again, if he was the type to somehow lose his hearing temporarily due to shock and heartbreak, enough to misunderstand the main point, then I doubt he'll move on all that easily. Even at the point wherein he was angry and wanted to give up before being confronted with the truth, I doubt he'd be easily able to move on considering how he is. I mean, in spite of everything, he continued to love his Hyung.
So it all worked out despite the mess at the beginning, thanks to their unwavering love and dedication to each other.