Kim Tae-hee
Kang Ho-gu (Choi Woo-shik) has never had a proper girlfriend, with girls constantly taking advantage of his sweet, naive nature by enjoying all the perks of dating then friend zone-ing him. His relationship-savvy twin sister Kang Ho-kyung (Lee Soo-kyung) mocks him and his best friends Kim Tae-hee (Choi Jae-hwan) and Shin Chung-jae (Lee Si-eon) for being sorely lacking in any dating skills.