Lu Chen and Su Qingyuan's grandfathers were old comrades. They had fought together against the predecessor forces of the "Dark Net" back then. The engagement was not only a sign of friendship, but also a way for the two families to join forces to protect the core technology of the Su Group (if this technology fell into the hands of the "Dark Net", it would endanger national security), and at the same time, Lu Chen had a reasonable identity to protect Su Qingyuan.
