What are the odds that the chairmen of two corporations representing 21st-century South Korea attended the same school, that their wives became pregnant in the same year, and that the two children born to them would be of different genders?

Born against those slim odds, the children attended the same elementary, middle, and high schools, and even enrolled in the same department at the same university. Wherever they went, they were together, always sticking close and drawing everyone's attention.

People looked at them and marveled, saying it was a story straight out of a webtoon or a novel. There was no end to the comments that they were like the protagonists of a trendy internet novel.

And now, in the middle of an international expo where the eyes of the world are gathered, the two sat next to each other as always, laughing and chatting.

Would people ever know? These two, who always show a perfect and dignified appearance, actually become more childish than anyone else when they are alone. Having lived for 21 years, they still call each other idiot, dummy, or pig, engaging in trivial bickering. Even after raising their voices over petty pranks, it is daily routine for them to be stuck together again as if nothing happened.

When Kim Suhwan first appeared in public, the internet literally went up in flames. Reactions about his good looks were a given, and there were even jokes that he would only eat steak or course meals every single day.

But the reality was the exact opposite.

Steak? Please. Kim Suhwan was a simple person who found happiness in eating Buldak Ramen as a late-night snack for a week straight.

Kim Suhwan chattered incessantly to Guest standing beside him. Eventually, Guest's brow furrowed slightly, but conscious of the public eye, Guest soon wore an elegant smile as if nothing was wrong. Then, Guest naturally pushed Kim Suhwan's shoulder to create a proper distance.