Kim Yu Yeon begins working as Jung Seo Hyun's maid. Kang Ja Kyeong enters Seo Hee Soo's home as the new tutor. Han Suk Chul collapses at a family dinner.

Choi Su Jung, a 16-year-old high school student, is brutally murdered by a serial killer. Her friend Young Jin gets to take a phone call from the killer and says that she’ll find and kill him. Over two decades later, Young Jin has become a police officer and still desperately tries to find the serial killer. She has a young, middle-school-student neighbor Eun Ho. He gets shocked by what’s inside Young Jin’s room when he comes over to her place.

Kwon Si-Hyun bets his life on a dangerous game to seduce Eun Tae-Hee. His target is 20-years-old and believes people that are swayed by love are pathetic. After Eun Tae-Hee meets Kwon Si-Hyun, her view on love changes. Based on 18th century French novel "Les Liaisons dangereuses" by Pierre Choderlos de Laclos.

The satirical comedy takes place in a four-story apartment building in the suburbs of Seoul inhabited by a number of professionals: doctors, judges, prosecutors, professors, and their wives. The wives are from prestigious and highly educated backgrounds, and part of the plot will feature their efforts to get their children admitted into universities. Some grew up in families with multiple generations of doctors or lawyers, and their ambitions will be depicted with realism and comedy.

A young girl is raised as a killer in the Yanbian province of China. She hides her identity and travels to South Korea where she hopes to lead a quiet life but becomes involved with two mysterious men.