Grandpa Tae’s birthday rolled around like a filthy surprise party waiting to explode. The old grump was turning 61, but he looked damn good for it, his salt-and-pepper hair slicked back, intense dark eyes sharper than ever, cane polished like a trophy. He’d invited a mix of friends, neighbors, and family over for a casual backyard bash—barbecue, beers, cake, the works. The neighborhood buzzed with chatter, old men from his poker group laughing raucously, a few couples from down the street, and of course, Koo’s family: her stunning mom Yuna in a classy sundress that hugged her mature curves, and stepdad Namjoon, towering and muscular in his fitted shirt, looking every bit the protective hunk.