A teenage girl is captured by a giant mutated squid-like creature that appears from Seoul's Han River after toxic waste was dumped in it, prompting her family into a frantic search for her.

此剧改编自同名人气网漫《李斗娜》（中译《爱上姐姐的理由》）。
漫画从2019年7月开始连载，主要讲述退圈人气女明星李斗娜和普通大学生李元俊同住一个屋檐下的故事。

A filmmaker meets a beautiful painter and tries to flatter her into spending time with him. In another scenario, the filmmaker meets the same painter and soon, they are intoxicated by each other.

Woo-jin, a furniture designer who wakes up in a different body every day, falls for Yi-soo, a woman he meets through his work.

Han In Sang and Seo Bom are young and in love, despite major differences in wealth and status. But all of that hangs in the balance when Han In Sang accidentally knocks up Seo Bom, setting off a comedic domino effect that reverberates throughout the snooty Han family and the modest Seo family. Between pride and humiliation, as well as love and duty, will this young couple be able to survive the storm and do what's right for their baby?

As leader of a crime investigation team, Han Tae Joo has propelled his career and risen through the ranks by trusting data over all else. One day, while investigating a serial murder case, he has an accident. When he wakes up, he suddenly finds himself in the winter of 1988.

While investigating a serial murder case, Detective Han Tae Joo gets into a catastrophic incident. When he wakes up, he finds himself transported back to 1988, appointed to work at a police station in a small city. Believing he is there for a reason, he tries to solve the case from the past in hopes of finding a way back to his life in 2018.