Xiao Chang Qing, Sun Qian Cheng and Chen Xin Cheng worked hard all their lives. After retirement, they finally got together and co-founded a warm retirement community. In the community, they solved problems that elderly people faced, and in the process, they recognized their own problems and reconciled with their family and with themselves

A mermaid from the Joseon period ends up in present-day Seoul, where she crosses paths with a swindler who may have ties to someone from her past.

Han Sun-woo is a rookie photographer. He doesn't talk much, but he is a kind and warm-hearted man. He is friends with Lee Eun-soo. They have been close friends for 20 years. Meanwhile, Lee Eun-soo works as a lyricist to make living. She has an honest and bright personality. Due to a reason, Han Sun-woo and Lee Eun-soo begin to live together at the same house for 2 weeks. Staying together, their relationship develops romantically.

Every last Thursday of the month at an all-girls high school, the students of Class 2–5 cast their votes in a popularity poll. The results classify them into Grades A, B, C, D, and F. If they fall into Grade F, they become legitimate victims of school violence.