Ran Bowen was a very cautious man. He divided the Qinglong Seal into two halves, keeping one half for himself, and the other, as she guessed, was given to someone he trusted very much. Despite being undercover for a year, Yu Jiang failed to get any information on this person.
Although everyone knew that Ran Bowen had no offspring, he actually had a marriage once. His wife was killed by his enemies when she was six months pregnant, and since then, Ran Bowen seemed to have become a different person, secretly plotting and recruiting soldiers, training assassins.
But according to Yu Jiang's observations and guesses, Ran Bowen had a lover who bore him a child. To prevent the tragedy from repeating itself, he protected the lover and the child very well, and they remained hidden from the outside world, with even his close relatives being unaware.
The other half of the Qinglong Seal should be in the hands of Ran Bowen's lover.