You have to figure since the prosecutors are controlled by the Moon administration that there really isn’t anything they can remotely find that would stick to Yoon:

Prosecutors on Tuesday decided to not pursue an investigation into main opposition People Power Party (PPP) candidate Yoon Suk-yeol, diminishing the likelihood that either presidential nominee will have their prospects affected by a prosecutorial probe.
Joong Ang Ilbo
The Seoul Central Prosecutors’ Office said that they decided to drop a probe into allegations that Yoon and his wife, Kim Keon-hee, violated the Improper Solicitation and Graft Act when Kim’s company garnered a great number of sponsors for an exhibition held at the Seoul Arts Center in December 2016 after Yoon was named prosecutor general.
Prosecutors looking into the allegations decided that there were no charges to pursue against the couple because Yoon was still the chief of the Daegu District Prosecutors’ Office at the time of the exhibition, and the anti-graft law does not address actions by a public official’s spouse.
You can read more at the link.


