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Myungha Tae is going to die in 300 days. Well… maybe. After getting sucked into his friend’s novel, "Love Interest Zone," 29-year-old Myungha becomes a 19-year-old high schooler again with one mission—make Yeowoon Cha happy or die. With only 300 days to succeed, Myungha must break past Yeowoon’s barriers and prevent him from experiencing the same tragic fate as he did in the novel. But with Yeowoon’s favorability toward him in the negatives, will he be able to survive?
"Absolutely no way to fall for this man! Why is he so unnecessarily beautiful and sweet?" Yoon-ji, entered the world of the novels that she used to write herself, and her pen name 'Marie', which only she knew, became the name everyone called her. While possessing a beautiful character's body, she dreams of a sweet romance, but she ends up getting entangled with the second prince, Enrique, who is destined to ruin her! "Where did I go wrong?!" A real different world survival romance!