A mistake on the night of a project closing party leads "Pann," a quiet civil engineer, to carry an unspeakable secret... a tiny life growing within the body of an ordinary man, resulting from a one-night stand with "Kuea," his perfect boss and the owner of the company.
Amidst the dust and steel bars of the construction site, love slowly builds alongside fear in Pann's heart—fear of rejection, fear of his body's anomaly, and fear of dragging the other down. Little does he know that for Kuea, this was never a mistake, but the beginning of a life plan he has long dreamed of... to build the strongest foundation for a family with his "heart."