I dont think their feelings are different, ghey are most definitely infatuated with each other its just that Hwayoung shows it differently, he is obsessed with the idea of keeping Gyuwon for himsel

This isn't completely true. Ash and Nicks relationship ended a while ago and Ash accepted doing this with Lyle to make Nick happy. In that same conversation Ash realized that he and Nick were never getting back together. Its in the first chapters... by now im pretty sure ash has started to like lyle