"....okay..." Seeing Nan Shen body was trembling Tan Hua couldn't say anything and kept her mouth shut. She indeed felt guilty distracting Nan Shen from his work but looking at him like this she was defeated.
It seemed that Nan Shen really took her as his real brother. It's obvious right otherwise why would he felt this worried for her until his body was shaking?
Well even though it's just a brotherly affection she was still happy.
Actually Nan Shen himself wasn't sure about his feelings to Tan Hua. He regarded her as his little brother but then he knew she was a girl so automatically he see her as his little sister.
But once again when Tan Hua was in her girl appearance he couldn't help but see her as something more than a little sister. Nan Shen still wasn't sure about his feeling since he thought he liked Mi Shu.
Maybe Nan Shen only need a little push to make him realize his feeling.