He Yuchen, a Chinese medicine time traveler, returned from the army after four years of fighting on the Western Front battlefield. He is the biological brother of He Yuzhu. On the train returning home, he encounters a sudden emergency of the chief. He relies on traditional Chinese medicine and acupuncture to save him. He demonstrates his medical skills in the first battle and is about to return to No. 95 Courtyard, intending to change Si Zhu's tragic fate.
