She was born to be a Shadowhunters and she had no idea that Demon blood is flowing in her vein. Clary never thought that shes gonna fall in love with Kris. She is a Shadowhunter, demon is her enemy and Kris is a Demon. How can she manages with it? 

The day she met Kris was never expected. She was lost from her friends when the vampire attacked them when they were hunting. If Kris was never be there to save her, she might be one of the vampire meals right now. 

Kris never thought about being inlove with a Shadowhunters infact that he's already had the beloved one. Its not his chosen btw, but in their believes, every Demons already had their couples ever since a baby. Eventhough Kris didnt like Hyuna that much but he still feel responsible towards her.

Junhyung knows that Clary would never accepted his love because he know that Clary's feeling is not the same as his feelings toward her. But still he gonna persue her until shes accept him.

Hyuna knows that Kris didn't like her as much as she like him. But shes gonna make sure if she can't have Kris, so nobody gonna have him. Because he was made to be her's.

Kai is such a good friend of Kris. He first dont like about kris's idea of taking care of Clary. Because he knows that The Shadow have been looking for Clary.