Gay man in an interracial relationship marries a girl to appease his parents who dont know about his sexuality. Those then come for a sudden visit and stay longer than planned. They are very different in tone though.
Both movies are part of Ang Lee's 'Father Knows Best' triology, so they both have a family focus and similar vibe. Both also star Winston Chao and Sihun Lung (in both movies he plays the father character) and have comedy elements as well.
Both are coproductions between the USA and Taiwan with an interracial couple and a focus on chinese culture. Also the mom in both is played by the same actress.
The films are very different in tone and quality though.
Both films are part of Ang Lees "Father knows best" trilogy. Both movies highlight the relationship of a bilingual chinese man living in the us with his american partner and his more traditional family. They also show insights into chinese culture and have their fair share of funny moments.
Similar as it contains a fake marriage. Differences being that in the Korean movie its a lesbian couple that arranges the fake marriage with a gay couple. Meanwhile in the Taiwanese movie its a lone woman being convinced to play fake wife for a gay couple.