The wife of South Korea’s ousted former President Yoon Suk Yeol has appeared for questioning by a special prosecutor, as investigators expanded a probe into suspicions of stock manipulation, bribery,

South Korea's former first lady Kim Keon Hee apologised on Wednesday and called herself "a nobody" as she appeared for questioning by investigators on a string of corruption charges that plagued her husband's term before it ended abruptly.

South Korean prosecutors have sought an arrest warrant for Kim Keon Hee on allegations of bribery, stock manipulation and political influence linked to her husband's case.