He lost a leg, and he consequently lost the ability to do many things.
For example, holding her, carrying her on his back.
Thinking back to when the house caught fire, he was even a burden to his father. Back then, if it wasn't for his father risking his life to throw him out of the fire, where would his life be now?
Sometimes, He Da himself is very afraid, afraid he won't be able to protect Chen Ning well, afraid that if anything happens, he will once again become a burden to her.
He Da now doesn't even dare to carefully look into Chen Ning's eyes to check if there's a hint of disappointment.
The two walk very slowly. Around them, laughing and playing children pass by. Chen Ning instinctively stands in front of He Da, protecting him, afraid that the playful kids might bump into him.
