Captain Ronnajak Jutathep, the eldest son of M.R. Ronnaphee, takes responsibility for Sunida, the younger sister of a late friend. When he enrolls her at his old school, he crosses paths with Jaipisut, a former classmate turned teacher. Jaipisut still resents Ronnajak for his childhood teasing, but they’re forced to work together when Sunida runs into trouble.

What starts as reluctant teamwork slowly turns into something deeper—until Jaipisut discovers she’s adopted. A brooch from her birth mother suggests she may be a Dhevaprom. As her true identity unfolds, Ronnajak must decide if their growing bond can withstand the weight of legacy and pride.