Luna

She knows she’s trapped in a very tight situation between two people’s feelings. She doesn’t know what to do. She knows how he feels about her and she feels about him. It’s a no win-win situation for her or for them. She’s not just in to him in a romantic away. He’s just someone who she looks up to as a model. She doesn’t want to cross any line after that.

She’s not scared. She just wants to concentrate on her career. For her, profession is more important than love. She will have plenty of that when she’s older and more mature. Besides, she likes someone else.

She just wants him to be happy... but not with her. She doesn't want to be with him. 

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Author's Note:

I think Luna, even in her age, doesn't want to get involve with anyone romantically. She's the kind of girl of that looks ahead without  letting anyone distract her from her her goal. So she doesn't like Onew.