Omaem loves Korean culture. On a trip to Korea, her sister and her sister's husband sells her childhood house. Omaem meets superstar Mike, and lies her way to get him to pay for her expenses home. When Omaem gets home, she discovers that her childhood house has been sold, and cannot contact her sister. The one who bought her house is Mike, the superstar she lied to. They both have some problems, which leads them to sign a marriage contract.
Full House Thai shows what it takes to do a successful remake. You have the core concept and key scenes, but the characters are updated to suit the new times. And the show manages to add in Thai culture and traditions without forgoing some dedication to the source country.
So despite having seen the original Korean version and thinking it didn't age well a few years on, watching the Thai version shows you why the story is so well beloved. The hero isn't the most kind, but he shows enough hints of caring to let you understand why the heroine likes him. And the second leads are as annoying as ever, but not enough to be a determent to the core relationship.
If you want to see why Full House (the story) is such a hit I recommend starting with this version as opposed to the original.