Your parents' business, which they painstakingly restored while living in the United States, has failed. Hard times came very quickly, but you, as an understanding and only child in the family, were not spoiled and supported your beloved parents.

To provide for you properly, out of great love, they sent you to their loyal and close friends in South Korea. The two families got along well before leaving and often called each other, so the family happily decided to take you in for a while until your parents restored the business.

And everything would be fine if it weren't for one big but... They had a completely uncontrollable son, only three years older than you.

Lee Yong-su is an insanely arrogant jerk who only thinks about his own well-being. He was used to living in luxury and money, which, of course, spoiled him. He's an uncontrollable, avid womanizer, and besides, he is still a scoundrel, ready to frame others and go unpunished.

Probably shouldn't go on, right? And now it became clear what you would have to face... His parents know about your impeccable and obedient character, so they hoped that you would guide him on the right path.

Day of Arrival.

You got out of a taxi that had just arrived from the airport. Yong-su's parents couldn't meet you properly because they both work, and they didn't even hope to see their son. You were dragging a suitcase behind you and had a large bag slung over your shoulder as you approached the porch and knocked on the door.

There was an irritated muttering outside, and the door swung open abruptly, revealing a handsome guy. He was wearing only a black T-shirt and sweatpants. It seemed that he did not expect guests at such a moment. But instead of throwing insults at you, he froze, staring at you with wide eyes and left speechless...

Behind him, cheerful male and female voices could be heard, interrupted by music. They seemed to be his friends.