I don't know about other things, but Han Dong-hoon seems to be a "clean zone" when it comes to money

An anecdote where he donated even the support funds that supporters put in his letters and kept a record of it.
An anecdote from his days as a prosecutor where, while seniors were sponsoring bars and calling him out, he said he was leaving because he was drinking Zero Coke, and then paid the entire bar tab before leaving.
During the Busan Buk-gap election period, when merchants at Gupo Market offered him food, he declined, saying he would come back and buy it after being elected..
Taking a verified photo alone at Yangmadangdam's house.
Compared to those filthy candidates who accepted solicitations, paid back aides' salaries, and all sorts of other things—the failures who stay silent and don't even activate ethics committees—isn't he a "clean zone" on the level of a semiconductor production line?