The series is about an incident that takes place when the owners of the boarding house called 'Guest Summer Palace', which breaks stereotypes, and boarders with secrets gather to find Lee Seol who disappeared 13 years ago.

Years after surviving horrific abuse in high school, a woman puts an elaborate revenge scheme in motion to make the perpetrators pay for their crimes.

A boy falls to his death at school, but Ok Chanmi does not believe that her twin brother, Park Wonseok, committed suicide. Chanmi transfers to her brother's school, Yongtan High, and meets Ji Sooheon, who witnessed her brother's death.

A story that captures the challenges, spirit and passion of youth as two students at the Korean National Police University study to become cops.

Woo Yeon met her first love, Lee Soo, in high school. Soo always helped Woo Yeon whenever she was in trouble and was sweet to her. One day, before Woo Yeon had a chance to ask him out, he told her that he's leaving to study in the US.

What if your cat was capable of turning into a charming boy? After taking time off, Sol Ah returns to school as she finds herself a place to live alone. Per her friend’s favor, Sol Ah takes in a cat named Hong Jo, and a story of the life of two housemates unfolds. However, Sol Ah is not aware that the cat, Hong Jo, has the ability to shapeshift into a human. Sol Ah’s friends start to notice weird things about Hong Jo whenever they run into his human form. Things are about to change around the peaceful single-resident complex, and Hong Jo finds it difficult just being a mere cat whenever Sol Ah is too busy with her life to pay attention to him. Will Sol Ah be able to recognize Hong Jo in his human form? Sol Ah and Hong Jo “Welcome!” you into their romance fantasy story.

Lee Ahn has the ability to read a person's secrets as soon as he touches them. He meets a woman who has secrets that she desperately tries to hide. The two team up to bring down criminals.