Taddao Bussaya (1997)

Taddao, the long-lost daughter of a wealthy businessman, is determined to reclaim her rightful inheritance after discovering the truth about her father's estate. To enter her family home unnoticed, she disguises herself as a young man named Sutad and gradually uncovers the secrets surrounding the household. Along the way, she becomes entangled in family rivalries, unexpected friendships, and complicated feelings for Chao Noi Yodkwan, the man who unknowingly brought her into the house. As her true identity and the family's hidden secrets threaten to come to light, Taddao must find her place in a world full of deception, conflict, and love.