"Cain didn't run back and ruin his happiness that he learned over the years" so fucking true. But I don't get the author they obviously want show Cain being free but are still schackling him to Jooin talking it was an order and still calling him master... they really do want Cain story to center around someone who does not care for him. The author so obsess with first love they refuse to let the 2nd ML move on.
Like it or not Cain isn't a real person, doesn't have a real personality and doesn't live in the real world. If the author uses him to say it was Jooin who decided, and not him, then that's the truth. If the author gives credit to Jooin for Cain's life, then that's the truth.
Time to just accept the story and characters are badly written, instead of projecting stuff onto them that contradicts what the creator themselves says.
The author trying hard to give credit to Jooin for Cain life trying make him important when he did nothing for him. They're trying hard to make jooin still part of his life. Cain realize YOU ARE THE ONE WHO DECIDED not Jooin. Cain was ready to leave before their talk. This is what you did for yourself, not the idiot.
You can tell the author wants both ML's to constantly remember Jooin when Jooin gave nothing to be remembered.
The difference is Cain didn't run back and ruin his happiness that he learned over the years, Cain really is the winner.