A most rare meeting took place at the nation's top office.
President Moon Jae-in sat down with the leader of the main opposition Liberty Korea Party to discuss the upcoming summit with North Korea.
Hong Jun-pyo was invited to Cheong Wa Dae by the liberal leader.
According to a senior official there, the duo agreed on the importance of the summit and discussed ways to make it a success.
But Hong reportedly said his party is against taking a step-by-step approach to denuclearizing the North, as in the past such measures only allowed the Pyongyang to buy more time to develop its weapons.
The former presidential candidate proposed that Seoul take what he calls a "Libya-style" approach in which the regime is given six months to a year to give up its nukes before given any compensation.
According to the Cheongwadae official President Moon did not directly respond to that suggestion.