Jakarta, Nov 17 (TIWN) South Korea's ambassador to the Association of Southeast Asian Nations (ASEAN) said on Wednesday that he has decided to step down from his post following a two-and-a-half year stint, a move that comes amid rumours that he plans to help Lee Jae-myung, presidential candidate of the ruling Democratic Party.

"I think I have done the best that I can for South Korea-ASEAN relations and the New Southern Policy," Lim Sung-nam said.

He stopped short of providing details, including his future plan. There have been rumors that Lim, a veteran diplomat who served as Seoul's ambassador to Britain and vice foreign minister, may join Lee's camp, with the election around four months away.