Like his sister Sarah Chen, Flynn was born in Shelter 74 and remained a lifelong shelter dweller. He became known from a young age to enjoy exploring different corridors and ventilation systems in the Shelter, but usually he preferred to stay on the lower levels tending to hydroponics with his uncle Heath.
Flynn went missing from the Shelter with no signs that he went to the surface. Sarah requested the help of the Wanderers to find him. ( Into The Wasteland)