Khun Chai Tharathorn is a cautious archeologist and professor of history at a university. He is the eldest of the five Juthathep brothers with responsibilities as the head of the aristocratic family after the death of their parents. His generation of males has inherited a promise made by their late father to marry a daughter of another aristocratic family, the Thewaphroms.
While his two grandmothers are keen to promote a match for him with the eldest Thewaphrom daughter Ketsara, he finds himself unexpectedly caught up in an antique robbery case during a planned archeological excursion with some students. Disguised amongst the students is Ketsara and a girl he has known since his childhood, Maprang. While the excursion suddenly takes on a more serious and dangerous turn, Khun Chai Tharathorn finds himself caught between duty and love.
