A large family gather to celebrate a birthday. It would seem like a great reason to get together. But the family is just a project of one of the "brothers" — an experienced psychologist who is conducting an experiment to create a "happiness formula". He believes that manipulating others, their emotions and desires, will make them happy. However, love interferes with the mathematical calculations, which can neither be calculated nor predicted.
A fake dating contract between a determined job seeker and a marriage-weary developer takes an unexpected turn as real feelings begin to grow.
Due to an unforeseen situation, a naive freshman and the campus’s popular senior agree to pretend to be a couple — but their fake deal begins to affect their real feelings.
Rookie Yuki lands a BL role with superstar Hayama, who proposes a fake romance for the cameras—until real feelings blur the script.
Pop and Mo's love is tested as Pop works in Catering tobe near her, but his feelings shift when he meets Oat, while Mo grows closer to a dedicated pilot trainee.
When the top chef Ling Yang who shouldered the responsibility of "Pickled Mustard Greens Family" met a biological professor Xie Yu Fei who had been single since born on a blind date, he thought it was not merely a farce, but they were bound by fate, becoming a beloved "contract couple" who were entangled with each other by "money".