Peaceful boarding house. One day, an American young man Smith enters as a new boarding student. The female boarders Yura, So Yeon, and Hye Jeong joke about Smith’s size and are anxious to flirt with each other. Smith fell into the temptation of female boarders… Watching this scene, Hyuk Joo and Myung Soo are jealous and demand that Smith go out…
Seul-gi has a satisfactory life with her rich and caring husband. However, she feels she's lacking something and meets Seung-hwan to whom she is very much attracted to. Seung-hwan is a free spirited man and seduces Seul-gi. The two of them experience an exciting but dangerous relationship. However, her husband Jeong-ho finds out but he's willing to let it go as he knows he loves her but he hasn't been able to care for her much as he's been so busy. He gives her the chance to make a choice and the moment comes where she has to make the right decision...
Jojo grew in the house of his wicked Lola Susana who never taught him to be a rightful person. He became an image of his grandmother--- deceitful, arrogant and very greedy. He intentionally destroys the lives of his brothers and his sister without knowing that his own actions leads to his own downfall.
So Jeong came to Korea to study with the condition that she lives with her relative older brothers. She followed her mother and immigrated to the Philippines when she was young, but she's planning to stay in Korea now that she's given this opportunity. It's a bit unfortunate that relatives' house is not in Seoul, but she decided to endure until graduation. Min Woo and Sang Woo are surprised by So Jeong's appearance they see for the first time since she became an adult. Min Woo is embarrassed by So Jeong, who remembers touching her breasts when she was young. Sang Woo peeps at So Jeong while she's in a shower, and So Jeong begins to be attracted to the opposite sex.
Soo-ji is a skin specialist who experiences retaliatory driving on her way to work and Captain Kwon helps her. Later, they meet at the hospital and start to feel attracted to each other. Soo-ji is tired of living a pretentious marriage life with her cheating husband and falls in love with Kwon...
Min-cheol goes down to the countryside to focus on the foundation project. He meets Gyu-ri, a scenario writer. They fall in love and spend a hot night together but the next day she disappears. Will he be able to find the 'perfect size'?
Jang-ho who dreams of becoming a chef is pretty close to his dad Yeong-soo; enough to talk about his girlfriend and they live alone. One day, Yeong-soo tells Jang-ho that he's getting remarried to a Russian woman. Jang-ho accepts this and meets Olga. He is surprised to see a young and beautiful woman standing before him. A few days later, Yeong-soo goes to Russia on a business trip and Jang-ho and Olga get to know each other.
Do Min goes to Bo Young in order to get money and falls in love with her. However, Do Min's feelings for her should not be discovered. Bo Young is just a target he needs to train. Do Min trains Bo Young, but his feelings for her never stop. Bo Young, who noticed Do Min's feelings, in order to escape slavery began training him instead. Bo Young joins forces with Jun Ho and after many twists and turns, they successfully train Do Min and try using him to escape slavery but are blocked by Sung Hee. Sung Hee tries to sell Bo Young and Jun Ho to Do Chul and Bo Young makes the final move to overcome the desperate crisis. Bo Young and Jun Ho succeed in dealing with Sung Hee. Bo Young enjoys success by taking revenge on Sung Hee and Do Min but is attacked by Jun Ho. Due to Jun Ho, Bo Young becomes a slave again.
While looking for a job, Min-hee lands a position as a secretary in a detective's office. However, she doesn't have much work. While Min-hee is consulting her brother's love interest with her detective, a case has been assigned to her. The detective thinks it's just love counseling and gets caught up in a case while investigating why they broke up.
Min-gyoo, who made a lot of money with real estate, got married early and has a son who is less than 20 years old. But his son brought his daughter-in-law, saying he was getting married this time.
Na-ri joined the company as a new employe, capturing the hearts of her colleagues with her outstanding skills and looks, but she had a plan! She pretends to be in love with the president's son, registered her marriage with him, and have other male motives who don't know about it pay for him recklessly. It's a love-war-like story where Hye-seon, who was in an internal relationship with the president, proceeds with the plan that Na-ri has made and eventually takes over the company.
Female employees of the call center work as customer counselors for a company that sells adult products. Under the company's policy of unconditionally satisfying customers, the hardships of employees who always have to endure the customer's power abuse continue. Manager Jang and new employee Yoo-ri, who have long endured and worked under team leader Kang, who wields female employees with his own power, appear in front of Joo-ri. Yoo0ri, who was in charge of Gyejinsang, one of the company's blacklists, as soon as she came. And Joo-ri, who made an unexpected friend with foreign customer Kenny.
Yeong-joon who loves a mysterious woman named Seo-ra succeeds to change the past by visiting a woman with mysterious powers. However, she is now married to a loan shark named Cheol-jae in the changed past. Cheol-jae lives in captivity under Seo-ra and plans a new love and life, while Yeong-jun agonizes over Seo-ra's happiness. The fate of these men and woman who have changed their pasts, unfolds.
Won-il convinces Ji-na to make money through phone tube. The video of the two went viral, and Won-il picks an additional person. Hwa-jin and Yoo-na who started to work together like that visit Ji-na one day to receive a video and Kwang-soo run towards them...
Yeon-joo and Chan-hyeok loved each other like any other couple at first. However, Chan-hyeok became cold to Yeon-joo, and after fighting, Yeon-joo leaves the house where they lived together. Yeon-joo walked to the place of memories while crying. She recalls her first meeting with Chan-hyeok and tries to forget him by drinking. Chan-hyeok calls Min-ah whom Yeon-joo had met in secret, and Min-ah knows Yeon-joo as Chanhyuk's older sister...
Tae-jin and Hye-jeong sense that there is a problem with their relationship so they decided to have a sex consultation to solve their problem. Sang-soo, who came to the sex consultation, suggests a solution for the couple. At first, they were embarrassed and awkward, but they accepted the sex advice to improve their marital relationship.
Ji-hee, who secretly liked Min-soo, happens to study together at Min-soo's house, who is struggling with the exam. In that situation, Ji-hee secretly imagines a romance with Min-soo. When Min-soo finds out that Ji-hee likes him, he puts his head on and focused on his grades. Meanwhile, stalker Na-yeong, who also secretly likes Min-soo, suddenly visits Min-soo when she sees Ji-hee coming out. Min-soo uses Na-yeong...
The office adjusted working hours due to COVID-19. Representative Jeong-yeon instructs her subordinate, Ho-soo, to install CCTVs to monitor other employees. Na-eun and Yeong-tae work the night shift. He's acting deviant, not knowing there's a CCTV in place...!
A perfect trio of crooks, their union is almost a dream team. Do-hee and Hye-ji visited a ski resort to successfully cheat and take a break. While they were planning to rest for the time being and conspire for the next scam, they heard that snowboarder Na Shin-woo, a national team member who recently divorced his granddaughter, will come to the ski resort for a long time. After hearing that Na will receive 5 billion won in compensation for her divorce, she plans to commit another fraud.
Yuko is in love with an old poet who happens to be also a married man. She waits patiently for him and only him, yet she is constantly being lust by others.