Hyesung just shows some interesting when something happen Iloveyaoiboys
Yup cause he is tsundere. Tbh Idk if he really love Dojin but when Dojin not around he did miss him. And he doesnt want to lose him even tho he knew the fact they bonded and cant be separated but he still afraid of Dojin leave him.
So I believe the author just want to depict Hyesung as a tsundere character while Heesoo as a loving and understanding character, and chowon as a dominant in rls.
I think Dojin really loves Hyesung but... I think that Hyesung doesn't really loves Dojin