The Hong Sisters wrote the comedy series Hwayugi ( 2018 ) .
Together , they have written popular romantic-comedies notably , My Girl ( 2005 ) , You 're Beautiful ( 2009 ) , My Girlfriend Is a Nine-Tailed Fox ( 2010 ) , The Greatest Love ( 2011 ) , Master 's Sun ( 2013 ) and Hotel del Luna ( 2019 ) .
Hong sisters