Smile In My Heart is mainly about a new "love song" that takes place in a five-star hotel. In the drama, Ming Dao plays as the second-generation heir "Liang Yufang" of a five-star hotel who starts from the bottom of the hotel due to his dissatisfaction with the family arrangements. He meets "Xiang Tianwei", a "poor girl" working at the hotel by chance, and thus writes a tortuous and romantic love song between a prince and Cinderella.