Yoon Tae In (Lee Jun Young), the leader of globally popular idol band Luna, is a musical genius struggling with worsening sleepwalking issues after the band's recent album failure. In Yoon Joo (Jung In Sun), a tour guide with dreams of owning her own house, unexpectedly becomes entangled with Tae In's life after a chance encounter. Scamming her way into Luna's residence, Yoon Joo is asked to help cure Tae In's condition, despite having no medical qualifications. Posing as his "doctor," she must navigate living with a self-centered idol while attempting to help him overcome his challenges. As they clash and gradually understand each other, Yoon Joo wonders if she can truly help Tae In or if she might become his biggest obstacle. This is a light-hearted romance exploring an unlikely relationship between a struggling tour guide and a world-famous idol. "Let Me Be Your Knight" is a 2021 South Korean romantic comedy directed by Ahn Ji Sook.