Dr. Zhang was one of the apprentices that Shen Ruojing took in when she was saving lives in the past.
She remembered that they were on a train when someone fell seriously ill and she needed an assistant to help with the treatment.
Unfortunately, the patient's family wasn't present, and there was no one to sign a waiver.
In such situations, only a few doctors would step forward, as they were afraid of getting into unnecessary trouble.
When Shen Ruojing heard some people chatting about their doctor's identity on the train, she knew that Dr. Zhang was one of them.
Even so, when she called for help, the others hesitated. However, Dr. Zhang stepped forward and helped her.
Shen Ruojing was impressed with Dr. Zhang, so she taught him a lot of medical knowledge. Dr. Zhang was also eager to learn and followed Shen Ruojing everywhere she went.
