While knowing some basic Korean phrases can enhance your experience in South Korea, it's not necessary to be fluent in the language before visiting. English is widely spoken in major cities, especially in tourist areas, hotels, restaurants, and public transportation hubs. Many signs and menus are also available in English, particularly in tourist-heavy areas.

However, outside of these areas, English proficiency may be limited, especially among older generations. In more rural or remote areas, you might encounter difficulties communicating in English. In such cases, having a phrasebook or translation app can be helpful, and locals are generally appreciative of efforts to speak even basic Korean phrases.

Overall, while English is increasingly common in South Korea, particularly in urban centers, knowing some basic Korean can still be advantageous for smoother interactions and a more immersive cultural experience.