
They become life and death companions. It's very cute.
There was a chapter where Kim Dokja was talking to Yoo Junghyook and then Yoo Junghyook told him to 'Shut up and leave.'
So, when Kim Dokja really did leave.
Yoo Junghyook continued to called Kim Dokja as Yoo Junghyook seemed to be worried for him.
I really do believe that they become good companions as Yoo Junghyook looks after Kim Dokja in his own way.
Hopefully this helps!!

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.Okie this might some kinda weird to ask but like do Kim Dokja and Yoo Junghyook ever like become genuine friends? cuz i really want to read the novel but i dont really know what to feel if they are just fighting and trying to hurt each other in each and every chapter they'll meet....