Youthful Older Sister

Eun-hye is a substitute lecturer. One day she is freaked out by being stalked and calls her cousin in to live with her as her bodyguard. Kang-tae is a test repeater and he's impressed with how hard working Eun-hye is and starts feeling fond of her. One day, he drinks with his friend Tae-bum and gets drunk while talking about his cousin.

Yeon-jae, who runs a wedding dress shop, decides to use her cousin, Dong-sik, who just got out of prison as her part-time worker, and lets him stay in her house. A sexy employee named Ji-na feels attracted to Dong-sik and flirts with him. Yeon-jae gets back together with Yeon-woo, the photographer, but is shocked to find out that he’s in a deep relationship with Ji-na. Yeon-jae gets drunk alone and crosses the line with her cousin Dong-sik…

Freshman college students turned friends, Jang-hee and So-hyeon, will be having their first blind date. Jang-hee and So-hyeon met Won-ho andDoo-sim through a blind date over drinks. Doo-sim, a sophomore asks Jang-hee and So-hyeon to call him 'oppa', however Won-ho teases him that he is younger than them. Jang-hee who is older than Doo-sim, jokes him to call her 'nuna', and then...