Master Mo was feeling complicated inside when he was talking about the kid who's using his dead son's name.
"You might have already guessed that much I presume. That's why we are here aren't we?" Without waiting for Bi Yuhan to respond he continued.
"Your grandfather asked my father for a favor to borrow my son's identity for a few years."
"I knew that we can't hide this for long. The reason why I'm revealing this to you is because your grandfather trusts you and I don't see any reason to hide it."
Bi Yuhan listened in silence and didn't interrupt. When he heard his words he discovered a peculiarity in his grandfather's arrangements.
His grandfather knew that Mo Ling would leave much sooner and prepared every little thing to perfection. So he asked his friend for this favor only for a few years.
After he knew what he wanted to know from Master Mo they parted ways after their quick meal.