What are Korean curse words? How do Koreans swear?
The "f-word" in Korean is ssee-bahl. It is considered a quite offensive word. Sometimes, you'd hear Korean men say, "Ah, ssee-bahl!" It's like saying "f**k!" Another Korean curse is joht-nah. It means 'very' or 'extremely' in an indecent manner. If a young woman says, "Ah, joht-nah shee-ruh," it means "I really hate (blank)" or "I f**king hate (blank)."
A "mild" version of ssee-bahl is jehn-jahng, which is like saying "darn!" Joht-nah can be replaced with guhb-nah, which would be like saying "freaking" in English.
By the way, do not be offended by Korean names such as Pak Yu or Yu Seok. They are just telling you their names.