Adorable brother in law

Rong Tian is a 26-year-old young teacher who died a precocious death when saving two children from being hit by a truck. However, he has an unexpected second chance when he is transferred to the body of a cannon fodder from a novel he read as a teenager. In this world of work there are three sexes: man, woman and ger. Rong Tian is the envious ger brother of the protagonist's wife, with whom he had a son. Wanting to change his fate from cannon fodder, Rong Tian decided to raise his brother-in-law's child and not make her life difficult and cause his own death. However, this may not be so easy after "your brother-in-law" returns from the war and begins to take an interest in him. [✓This work is original]