Tae worships his mom Mimi and deeply resents his strict, controlling dad, Namjoon. One day he accidentally discovers that Namjoon has been secretly sleeping with Mimi's best friend, Koo. Furious at the betrayal and disgusted that his dad could hurt his mother like that, Tae decides not to expose the affair. Instead, he plots his own twisted revenge: he plans to lure Koo away himself, relentlessly tempting and seducing her until she becomes addicted to him, stealing her from his dad and ultimately shattering his dad's world in the process.