Li Ningyu is an excellent intelligence officer who has accomplished many very difficult daily tasks for the organization. In the whole process here, someone guessed who she really was, and this person was the one who got the flame from gold. Kim is an old fox, and everyone has nothing to hide before his eyes. He can only guess the answer that Li Ningyu got after he cracked the code by guessing.
For various reasons, Golden Fire was arrested by Longchuan Yuan Fei as an old ghost. Although Jin Huo knew at that time that the real old ghost was Li Ningyu, he didn't expose the other party to Longchuan Yuan Fei, but explicitly asked to hand it over to Li See Yu Ning.