Yeah, good luck with this especially in South Korea where Internet mud slinging is almost a national past time:

Ahead of its official launch, a special interest group supporting UN Secretary General Ban Ki-moon has asked similar groups linked with other potential presidential candidates to agree not to maliciously attack or slander each other.
The group, named Banditburi, or firefly in Korean (a play on the UN chief’s surname), is scheduled to hold its inaugural meeting on Nov. 10.
Banditburi has reached out to groups that support liberals Moon Jae-in, the former chairman of the main opposition Minjoo Party, and Ahn Cheol-soo, former chairman of the People’s Party, to agree to avoid any mudslinging ahead of next year’s presidential elections.
Kim Sung-hee, chairman of the preparatory committee to launch the group for Ban, told the JoongAng Ilbo over phone on Wednesday, “We asked other groups supporting key potential presidential contenders, including the opposition’s Moon Jae-in and Ahn Cheol-soo, as well as the ruling party’s Kim Moo-sung [former chairman of the Saenuri Party], to forge a gentlemen’s agreement.”
He continued, “The political scene is messy as is, so we proposed that at least groups like ours should not engage in slander or malicious comments online, or muckraking of any kind.” [Joong Ang Ilbo]
You can read more at the link.