Episode 21 recap: Su Yun encounters disaster in the disaster area, and Zheng Ren goes insane searching for him.

He Qian returns home, overjoyed to see his daughter, and is deeply moved to see his wife selling goods to support him. However, when he reveals the truth, his wife's expression makes him feel uneasy. He quickly calls his colleague, shows the invitation, and tells his daughter that he will be joining Zheng Ren's team, and may not be able to be by her side often, but his daughter is very supportive.

Su Yun welcomes He Qian's joining, but Zheng Ren is still worried about the equipment issue and wants to live stream, while Su Yun feels they are not yet fully prepared. Rudolph mysteriously comes to pick up Chang Yue after work, making Su Yun uneasy. Chang Yue tells Zheng Ren that the conjoined twins need to be transferred to another hospital, and the family hopes to try without regrets, to which Zheng Ren surprisingly agrees.

Su Yun reminds Zheng Ren to consider this carefully, and Zheng Ren sincerely communicates with the family, stating that they currently have no good solution, and suggests they go to a better hospital. The family is grateful for his understanding.

Lin Yuan is surprised by Zheng Ren's decision, while Chang Yue believes Zheng Ren considered the family's wish for the child to live.

Rudolph invites Zheng Ren to go to Germany for the surgery, but Zheng Ren refuses. At this time, an earthquake strikes, and Hexi Peicheng is hit by the disaster. Su Li urgently calls for doctors to go to the disaster area, and Zheng Ren and the others immediately respond. Su Li is concerned for the safety of the medical staff.

Lin Yuan resolutely chooses to go to the disaster area for rescue, although Lin Ge and Su Yun are worried.

They travel for a long time and arrive at the disaster area, witnessing the horrific scene of the ruins. In the disaster area, Lin Yuan faces a helpless little girl's crying and can only try his best to comfort her. Meanwhile, Zheng Ren and the other doctors are doing their utmost to treat the injured. Zheng Ren carefully writes the medical records on his hand so that other doctors can quickly and accurately treat the patients.

During a rescue operation, Su Yun and Zheng Ren separate, and Su Yun accidentally discovers a little girl trapped under the ruins. Although facing great danger, Su Yun still tries to rescue her, but his psychological barrier makes him hesitate. At this time, Zheng Ren is also desperately moving stones outside, believing that Su Yun will be fine.

In the critical moment, Su Yun overcomes his psychological barrier and successfully performs surgery on the little girl.