Loverboi : Revenge is a Bitch Episode 5

Joong-gi, a second-generation chaebol, meets Soo-ji on a blind date. Although he is a notorious “papa’s boy,” the woman easily seduces him, and they head to a motel. However, once they are already in front of the motel, Joong-gi hesitates and ends up leaving. The truth is, he suffers from erectile dysfunction, and to avoid disappointing Soo-ji, he undergoes intensive training from Ji-won, a beautiful secretary assigned to him by his father.