It is terrifying when someone like Eun Hyun-jang becomes your enemy.

‌"They have plenty of time and a massive amount of money"
Because they have so much time, they don't need to rush to find your weaknesses.
Because they have so much money, they don't even have to do the work themselves, and they can spend their time like that without any impact on their livelihood.
And ultimately, because they have both money and time, they won't even consider a settlement; they will just continuously follow you, hitting only your weak points to make it hurt.