Driven by Sin: My Secret StepbrotherEpisode 4

Chloe, an orphan girl, moves with her mother into a top-tier wealthy family, living under the same roof with her stepbrother Jax, the campus heartthrob. By day he is cold and ruthless, but by night he is "Shadow," the unbeatable god of the underground racing circuit. Chloe accidentally discovers his double identity. Bound by this secret, they go from testing each other to falling into a forbidden love.