He was sent to jail on Nov 30 after the Criminal Court revoked his bail on terrorism charge.
He was greeted by Red Shirt activist Thida Thavornseth, leader of the pro-government United Front for Democracy against Dictatorship (UDD), his family and some supporters.
Talking to reporters after his release, Mr Korkaew stood firm that he will continue to join the lineup on the Red Shirt’s political stage but will be more careful in his words to avoid future problems.
He called on Red Shirt supporters to refrain from anger and to cooperate in lifting Thailand from the six-year pitch so that it moves on.
“The opposition should overlook [fugitive ex-prime minister] Thaksin shinawatra and Red Shirters should also overlook [opposition Democrat leader] Abhisit Vejjajiva,” he said, adding that he would fight on steadfastly as a UDD core leader.
He will return to jail when the present parliamentary session ends.
The Criminal Court announced on Thursday that the detention of the Pheu Thai MP remained unchanged but he would be temporarily released to attend the parliamentary session as requested by Parliament.