Brilliant Pearl(2012)

Original title: มุกเหลี่ยมเพชร

Petch is a perfect, confident, and flirtatious rising businessman owner of Star Diamond, the largest diamond company. Mookda is an international policewoman with special training in Aikido who disguises herself as a nonsensical, troublemaker secretary to investigate the stolen diamond Adorella. As crazy as Mook is, Petch cannot help falling in love with her.