After her father’s sudden death, Anusorn returns home to find her inheritance gone and uncovers a dangerous mystery. Disguised as a boy named Ooth, she becomes Pathavee’s assistant to investigate the truth while navigating family conflicts and hidden motives.

Kaew and Penporn's parents were killed by a bad guy when they were little. After Kaew's escape, she was trained as a fighter by a close friend of her father. After growing up, Kaew returns to her village disguised as a man, wearing a red mask and becomes Nang Singh while she sets out to take revenge against the wrong doers. Thummo is a police officer sent on a mission to kaew's village. He is in charge of arresting Nang Singh and becomes a friend of Kaew in the meanwhile. What's more, Kaew finds herself falling in love with Thummo.