In this paper, we present Radar-Immune, a novel parallel interference cancellation system. Radar-Immune leverages phase modulation of two chirp sequences, effectively distinguishing the interfering signal from the reflected signal in the Doppler domain. Additionally, we introduce an intersection algorithm to cancel parallel interference. We implement Radar-Immune and conduct performance evaluations for interference cancellation. Experimental results demonstrate an impressive interference cancellation rate of up to 97%.