All right now I get it. It's called "someone else's bl manhwa'. Of course the black and green haired guys are the main couple. Now it all makes sense. The green haired guy must have a crush on the black haired guy and he knows it. All that"he listens to me" stuff now makes sense 
→Team Dohwa( ꈍᴗꈍ)
→Cherry blossom after winter is my absolute favourite. Have re-read it four times already. If only I could erase my memory and read it all over again😩.
→Cherry blossom after winter is my absolute favourite. Have re-read it four times already. If only I could erase my memory and read it all over again😩.