Thread of Lies (; lit. Elegant Lies) is a 2014 South Korean film based on the 2009 bestselling novel "Elegant Lies" by Kim Ryeo-ryeong. Directed by Lee Han, it starred Kim Hee-ae (in her first film in 21 years), Go Ah-sung, Kim Hyang-gi and Kim Yoo-jung.
For Kim Hyang-gi - 21 years old, Thread of Lies was her first film 
It does not state how old Kim Hyang-gi was or if this was her first film or not.