Jinshan knows that Lin Jiayin is undercover, but he thinks that Lin Jiayin has defected and Lin Jiayin has helped him become the boss, so he still trusts Lin Jiayin. The outcome may be that Lin Jiayin was killed or caught. Because Lin Jiayin didn't default, she was undercover, and she was Guan Hongfeng's apprentice in those days. Guan Hongfeng sent her undercover. Lin Jiayin is an excellent criminal policeman and won't default.