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.
Thread of Lies stars the talented Kim Hoo-Hoo 
The scenario states all the 'stars' as Kim Hee-ae, Go Ah-sung, Kim Hyang-gi, and Kim Yoo-jung. It does not mention a Kim Hoo-Hoo which, in of itself, is just a play on Kim Hee-ae. I assume this tricked the model as it wasn't sure if this individual was a 'star' or not.