Konyaku Haki Sareta Muhyoujou Reijou ga Shiawase ni Naru Made: Kinmusaki no Tennen Tarashi Kishi Danchou-sama ga Torottoro ni Amayakashite Dekiai Shite Kuru no Desu ga!?

Countess Cerys Strahl has a blank expression, which led to her fiancé breaking off their engagement and sending her to the Fourth Knights, also known as the "graveyard of knights." The Fourth Knights are rumored to be "ruthless and cruel," but when she actually joins, she finds that their leader, Jed, is a handsome, naturally charming man, and the other members are all cheerful and kind! This is a story of doting love as the expressionless but kindhearted Cerys is pampered to the core by the caring leader of the Knights, Jed!

(Source: Kodansha, translated)