Ai Haibara stared at her, the one girl she couldn't win against no matter how hard she tried. She was after all exactly that what every girl wanted be, besides Ai herself, she supposed.
She was friendly to everyone and made easily friends with persons she didn't even know an hour before. Ai herself was cold to every person she didn't know and guarded herself and thus made almost no new friends.
She was caring, even if she didn't know the person and said person was injured she would help that person to the best of her abilities and care about that person. Ai herself just couldn't bring herself to care about what happened to persons she didn't know and even if she did, she wouldn't help them to the best of her abilities because it would be too troublesome.
She was open and honest, never wanting a person, that didn't wrong her, something bad. Ai on the other side was secured, never showing much emotions and telling lies to keep herself "safe" and she would mock people just for the fun of it.
She was bright and energetic, always wanting to do something and having fun outside. Ai liked it inside, where she could have her silence and could type at the Pc hours upon hours.
She had not her own health in mind but that of others, as if her own wasn't as important. Ai would have never thought like that, when it didn't come to them and would never really endanger herself just to save a person she didn't even know.
She was fearless, faced with murderers that wanted to take her as hostage again and again she stood strong and defended herself as if it was normal. Ai couldn't be so fearless, because she knew a cornered animal was the most dangerous one and always feared that a murderer would take her as hostage.
She always thought optimistic and never faltered from her view that everything would end in a happy ending. Ai couldn't think so, because she knew for herself there was no happy ending, as long as they existed and he would only look at her.
She had him after all and Ai could only envy her, after all only one of the two could have him and she had clearly won … no after all it wasn't even a fight it, was clear from the beginning.
So she smiled just sadly as he asked her if everything was okay and said "Everything is ok, tantei-kun" After all she couldn't be like her, it just wasn't possible.