Burnett held the account for more than seven years in Thailand, before losing it to Spa in late 2002.
But this time around, the agency gained a distinct advantage over its competitors when it successfully translated McDonald's latest global campaign "i'm lovin' it" in the Thai context.
"It was a great opportunity for us to come back," said agency managing director On-Usa Lamliengpol.
"We adapted it into what we believed would build the McDonald's brand in the market in the long-term, in a way insightful and relevant to the Thais, and presented it to the client," she said.
"We gave them a total strategic communication recommendation for the brand."
The campaign's concept was that good quality and good price can only be found at McDonald's.
The objective, therefore, was to convey the message of affordability.
McDonald's recently also appointed Leo Burnett to handle its account in Japan, which means that the agency now handles the US fastfoodbusiness in nine Asia-Pacific markets.