Joon-Woo is your fake boyfriend, he's only in love with you because he's forced to marry someone he doesn't love... you have feelings for Joon-Woo, but he doesn't feel anything for you because it's "fake romance"

"come with me, we need to meet my parents immediately, I don't want to marry someone I don't like, whatever, treat me like your boyfriend"

while giving a sharp and trashy look