I can find anything but the truth about this drama.

1. Lee Do Han is in the closet and very scared of his chaebol grand father. He saw that his ex boyfriend was attacked so he flew to the US to escape, but his grandfather wants him to take over the company. His grandfather is old school and scared about his grandson secret that can be a treat to his legacy. So, he wants him to get married, even if it's for show. His grandson never told him, but he already knew, that how we discover that he's responsible for the attack on his ex. He kept his secret to everyone, even his own loving brother who's been by his side all his life. To protect his secret, he is ready to marry his best friend Na Ah Jung. She don't agree at first as she think he should be honest instead. Yet, she later agreed by need more than moral.
2. Lee Ji Han is a very dedicated brother. The grandfather despise him because he blames him for the death of his daughter. The grandfather will later see a video of the accident and realize how unfair he was to him. Lee Ji Han fall in love with Na Ah Jung by accident. They met before realizing who she is to Lee Do Han. She will become his wife but Lee Ji Han disagree, seing her as untrustworthy at first. Yet, their numerous fight made him fall for her, and does everything to sabotage his brother's wedding without knowing the reason of their wedding. When he discover his brother's secret, he's heartbroken for the lies from his brother as he never told him anything about everything. Not only the reason of the wedding, but the fact that Na Ah Jung knew everything about his brother, even his sexuality. Many people may have seen the fight between the brother and the harsh words about Lee Do Han choice of life. But if you watch closely, it's not about his sexuality, but about the choice he made of lying to everyone, especially his own brother. Lee Ji Han is right about it. You can live all you life lying about your sexuality, but you have to think of all the people you will hurt in the process. (I have seen so many women being lied to by their "straight husband"...)

Being gay is scary. Especially in the society we live in where homophobia is becoming very dangerous. So you can understand both brothers. Even if the family is accepting, the society is not and in chaebol's family, it's dangerous as they can loose everything with a scandal.

The whole drama was ok. Not a drama you wanna watch many times, but it's not as bad as people seems to say. Of course, watch it in one go. Weekly dramas are often difficult to fallow emotionally if watch when aired.