I actually enjoy sturbborness, I'm stubborn myself but I like it when it yields good results and it's backed up by logic lol, if a character has values that they want to protect and seek out, I think stubbornness can even become something inspiring, it becomes determination, but in the case of Doyun it's become tiring because he's, at the end of the day, just being inconsiderate to the person that he chose to be commited to and to his family. He's very childish, he seems to very shielded by his siblings and that probably caused him to also not face consequences at times so I think it comes from that. 
It's just not my favorite dynamic when it comes to romantic stories lol, irresponsibility in that scenario makes me anxious lol especially with the unprotected sex + him not even showing himself capable of taking care of himself... just yikes, ya know?                                            

		
Doyun's brother is the only character I care about┗( T﹏T )┛
I need to see more of him and the doc man, fuck this redhead twink lover and Doyun being irresponsible yet again because he is a stubborn little shit-
Give me a soft alpha who wants to be loved, cherished and accepted.