Wait...why do they allowed it then.. if the dragon is the HQ property then Sung Jin-wo is "illegally" using it to make the dragon his subordinate, because Sung Jin-wo request is only want to see not summon... Welp at this one chapter Sung Jin-wo is wrong... Even if no one can summon the dragon except him, but the dragon corpse is not his, so he's "stealing" the dragon..
But whatever... I'll just stay tuned for the next chapter..