Hee Ram and Ga In met in a general education class, Psychology of Love and Sex class. In this class, students have to perform a dating mission as a mock couple. A hard-working student Hee Ram and an easy-goer Ga In don't quite get along with each other from their first meeting.

The school-themed comedy/drama revolves around a teacher (Zhou) and a student (Lin Xie) who happens to have bad luck everytime they engage with each other. While Monsta X plays themselves as students who are highly admired by everyone at the school.

Yang Kkot-Nim is a therapist at a rehabilitation hospital. She is bright and brave, but highly emotional inside. Since her father passed away, Kkot-Nim gets through the world with her step mom Jang Soon-Ae, who has been always nice to her step-daughter Kkot-Nim.

It tells the story of Qian Guang, a retired middle school history teacher, his adopted daughter Qian An'an and several other sons and daughters in their complicated family.

Ah Ke is an unambitious, unimportant, plain sales clerk who is fanatic about baseball. After a year of secret crush on his boss, Wen Zi, he decides to confess to her on her birthday. However, an irresponsible prediction from an eccentric tarot card girl leads him on a love journey that can only be described using baseball terms: Three balls and two strikes.

Han Ruo Fei obtains a time traveling polaroid that enables him to go back to 10 years ago on short periods of time. He attempts to revive his dead celebrity wife and find the mastermind of the conspiracy plotted against him 10 years ago.

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