The real reason why no one in Korea can beat this guy

To be honest, no one in Korea can beat "Mershima" in Busan. This is likely the truth.
He has likely withstood every psychological warfare tactic the prosecution and police could throw at him.
Even the President probably spoke the truth because they couldn't withstand this.
But he truly endured it all.
Actually... I think he could start as a Managing Director at a major corporation right away.
Because even a Managing Director at a conglomerate would probably not be able to endure it and commit suicide, right?
Because there is no one in Korea who has endured for 12 years. No one in the entire country.
He probably endured this too... even when that NIS employee betrayed him from within, you know that "Secret of the White Room" episode on PD Notebook?
He endured all of that too.
Honestly, if someone endures this much, there is one thing suspicious now.
[It seems to be the President's daughter's secret. It might be something the President cannot trust.](Speculation, Delusion)
He can't do anything because of the President's daughter.