Cha Tae-Hyun (My Sassy Girl) stars as Hyun-Su, a former TV actor turned popular radio personality. Hyun-Su's ratings rise when he counsels a single mother over the airwaves to seek out her long-lost father and show up on his doorstep with her young son. Despite his advice, Hyun-Su pities the unsuspecting grandfather because he's an avowed player and happy with the single life. Too bad that he's actually the unsuspecting grandfather; single mother Jung-Nam (Park Bo-Young) is his daughter from his ninth grade affair with an older woman, and Jung-Nam was pretty young herself when she conceived her son Ki-Dong (Wang Seok-Hyun). Together, the combined age of the three generations barely cracks 60. Planned Parenthood would have a fit!