In The Beast on Her Leash movie, to find evidence of Vincent's crimes—the murderer of her parents—Eliza accepts an invitation from Vincent's father to become the president of Evertech AI. Unexpectedly, the father imposes an additional condition: she must educate his youngest son, Ryder, who is as ferocious as a wild beast, into a civilized man. After agreeing, Eliza finds Ryder an extremely difficult man to handle, and the two often clash with intense tension. However, during their coexistence, Ryder falls in love with Eliza. When Eliza realizes she has feelings for Ryder too, she is forced to push him away in order to pursue Vincent's crimes. The entanglement among them is filled with ambiguity and excitement, where opportunities and dangers coexist.