Zhu Liu indeed knows where the Underground Palace of his foster father, the old Prince, is, but he cannot speak of it.
So he lied, claiming only Ye San knew where the foster father's Underground Palace was, and since Ye San was dead, there was no way for Lin Fei to learn from the dead.
By doing this, Zhu Liu wouldn't have to betray his foster father.
Because he knew his bodyguards were all loyal to his foster father, and if he betrayed his foster father, his foster father would immediately know.
And if his foster father knew Zhu Liu betrayed him, the only outcome would be death.
His fear of his foster father surpassed his fear of Lin Fei.
However, he didn't expect that he would fall victim to Lin Fei's trap.
Lin Fei simply took him into a room, stayed for over ten minutes, and then he became the prime suspect for betraying his foster father.
Even jumping into the Yellow River couldn't cleanse him.
