친구(chin-gu, chingu)
A person with whom one has a close and emotional relationship
When to use
Introducing childhood friends, Talking with close people, Sharing emotions
The nuance
Use when emphasizing emotional closeness and intimacy. Common in everyday conversation to show deep trust and affection.
지인(ji-in, jiin)
Someone you know but are not close to; a mere acquaintance
When to use
Business networking, Introducing at formal events, Mentioning casual acquaintances
The nuance
Used when the relationship is formal or less intimate. Common in business or formal contexts, indicating weak emotional bonds.