Gong yoo is a very flexible actor. It shows here that his love for eun cha is so great that he promised for an all in relationship because he thought that his lover is a guy. Eun cha on the other hand shows how he cares for his family that she has to disguise a man to work in the coffee prince. I like the part when gong yoo and his grandma help eun chan to fulfill her dreams to be a renown barrista and she has to study abroad. On the other hand, gong yoo decided to stay in korea and did not pursue his ultimate dream job as a lego designer in usa because he does not want to be far from eu chan. I think that is a true measure of love by willing to sacrifice for the happiness of someone