Tymn (Ferin), the bestselling author of "10 Rules Before I Fell for You," believes love can be explained through theory. She travels to a quiet countryside homestay to write her new book, only to discover the owner, Lean (Puifai), is the same person who once criticized her work online. The clash between someone who believes in the logic of love and someone who believes in pure feelings leads Time to test her 10 rules of falling for someone with Lean. But the more she tries to prove her theory, the more she begins to wonder if this is just an experiment... or real love.