SEOUL, South Korea — In an extraordinary display of abject apology during a moment of supreme crisis, South Korean President Park Geun-hye took sole blame today for a “heartbreaking” scandal amid rising suspicion that she allowed a mysterious confidante to manipulate power from the shadows.

Park also vowed to accept a direct investigation into her actions, but the opposition, sensing weakness, immediately threatened to push for her ouster if she doesn’t distance herself from domestic affairs and accept a prime minster chosen by the Parliament.

“I feel a huge responsibility (for the scandal) deep in my heart,” Park said, her voice shaking during the high-stakes televised address to the nation. “It is all my fault and mistake.”

Park’s comments were rife with astonishing moments, and included a frank assessment of her relationship with the woman at the heart of the scandal, Choi Soon-sil, the daughter of a cult leader and a longtime friend of Park’s.

“I put too much faith in a personal relationship and didn’t look carefully at what was happening,” Park said. “Sad thoughts trouble my sleep at night. I realize that whatever I do, it will be difficult to mend the hearts of the people, and then I feel a sense of shame and ask myself, ‘Is this the reason I became president?’”