Long Yueling heaved a long sigh of relief. [It is not as simple as stupid!] This answer could even be said to be extremely clever!
You have to understand that if Fang Shan were to say "Never heard" at this time, then thinking about Fang Shan's tone just now, Lian Yue would definitely be very suspicious. But if Fang Shan said that he had heard it before, yet was unable to say where he had heard it before, it would similarly arouse Lian Yue's suspicion. Now that Fang Shan had turned Nangong Tai into the narrator, it couldn't be any more ingenious. After all, Nangong Tai was already dead. Moreover, it was very clear that Nangong Tai was someone from the Divine Kingdom, so he definitely had a certain understanding of Divine Kingdom.
Lian Yue was relieved when she heard it. She nodded and said with a sigh, "Pity you, Mister Nangong. We were supposed to be at the Hero Dinner, but we didn't know that someone had killed him …"