Ko U-Yeong is just a disguise. of course, he doesn’t tell anyone that. after all, who would believe that a 37 year old man named Hong Dae-Yeong was somehow turned back into his 18 year-old self after divorcing his wife. in the meantime (while 18), why not make up for lost time with his two kids, who are apparently in his class. Of course, this all goes down the drain when his wife falls in love with another man — a baseball star. Heartbroken, U-Yeong finds comfort in another girl — you