1. What does it mean?
남친룩 combines 남친, boyfriend, with look. Fashion posts use it for comfortable, put-together styling that feels wearable on an everyday date rather than like an elaborate stage costume. Shirts, knits, and simple trousers are common examples, not required pieces.
Also written or said as namchilluk
2. The nuance
It is a subjective style label, not evidence someone has a girlfriend or a rule about what all partners find attractive. Anyone can borrow elements of the look.
3. Examples
“니트에 면바지를 입으니 깔끔한 남친룩이 됐어.”
The knit top and cotton trousers made a clean, approachable boyfriend-style outfit.
“남친룩이라고 소개된 코디에서 색 조합만 참고했어.”
I borrowed just the color combination from an outfit labeled a boyfriend look.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.