The Legend of Shen Li Episode 23

Shen Li leads Fu Sheng into battle above the Eastern Sea, where they engage in multiple rounds of combat. Mo Fang suddenly shows up to stop Fu Sheng, forbidding him from harming Shen Li. It's then that Shen Li realizes that Mo Fang is Fu Sheng's young master. A close friend who has been by her side for many years, whom she has faced countless trials with, and whom she has protected with her life, turns out to be the traitor causing chaos in her realm. Fu Sheng insists on obtaining the Blue Sea Pearl from Shen Li, otherwise, their thousand-year plan will be ruined. When Mo Fang refuses to comply, Fu Sheng binds him and uses the Water Freezing Technique, which he secretly learns, against Shen Li. When Shen Li is trapped underwater, Fu Sheng thinks he has succeeded, but she unexpectedly breaks free and delivers a fatal blow to him. (Source: Viu)