"Mo Lam Bodyguard" is the story of Captain Thepthai, a police officer assigned as a secret bodyguard to Dr. Nicha, the daughter of a leading businessman in Thailand.
Nicha was recently confronted by a group of people who had a business conflict with her father. Captain Thepthai disguises himself as Rungfah to protect Dr. Nicha from the bad guys.
(Source: Thai = one31.net || Translation = MyDramaList)