Modern youth find it difficult to travel back in time because of "Love in the Siheyuan" and become He Yuyang, the eldest son of He Daqing in the Siheyuan in 1942 - a child who has never appeared in the original work. Although the Siheyuan at this time was not as full of calculations as it was in the later period, it still concealed the friction between family members and was shrouded in the pressure of survival in the turbulent era.
He Yuyang knew that his mother Liu Yan would suffer from dystocia when giving birth to his sister He Yuyang in 1944, leaving the root of the disease and dying early. This became his first priority after time travel. With the prophet brought by time travel, the sign-in system (which can obtain technology and weapons before the 21st century), tens of millions of acres of spiritual spring space (planting and breeding, time acceleration, storage), and a set of martial arts secrets, he began to make every step:
