Moon Jae-in, the presidential candidate of the main opposition Democratic United Party, poses for a picture Tuesday afternoon before holding a discussion with Cho Guk (left), a professor at Seoul National University, at Haja Center in Seoul`s Yeongdeungpo district. Moon said he could propose to amend the Constitution if elected, saying, There is a public consensus on a four-year, two-term presidency. As we can see in the past history, we could consider creating the post of vice president.