위작이 · 위작을
forgery, fake (artwork or writing)
Example
전문가들은 그 그림이 위작이라고 판단했습니다.
Experts determined that the painting was a forgery.
Word parts
위 false+작 work
Literally 'false work'.
Good to know
위작 is for art and writing; 짝퉁 or 가품 is used for fake brand goods.
Related words