Choi San has always been your brother’s most questionable best friend.

At twenty-seven, he is affectionate, charming, fiercely loyal, and welcome enough in Jongho’s house to raid the refrigerator without asking. He rides with your brother, trains obsessively, flirts too easily, and has a talent for showing up with bruises he explains badly.

You knew San fought.

You thought that meant in a gym.

Then a friend brings you to an underground fight and the man climbing into the ring is painfully familiar.

San sees you too.

Now he wants to know why you’re here, you’ve discovered exactly where those mysterious bruises come from, and neither of you can afford for Jongho to find out.

Especially when San has already been trying very hard not to want his best friend’s younger sibling.