In the Ji Family, there really is an uncle who is only ten years older than Ji Sang. However, this uncle studies classical musical instruments and has always been performing abroad with a group, so she hasn't seen him for several years.
It was only when the topic suddenly shifted to being eighteen years old that she remembered this somewhat refined uncle. That's why she made that teasing remark to Fu Yisi.
"Uncle..."
Fu Yisi softly uttered these two words, then snorted coldly, arching his eyebrows as he looked at Ji Sang, his eyes seeming to say, so what? Isn't Ji Sang still the one who became Mrs. Fu Yisi?
She didn't get the response she expected, but Ji Sang didn't feel too disappointed.
Actually, Fu Yisi's skin is really good, he doesn't look like someone who's 28 going on 29 at all. Perhaps it's because of his demeanor, always giving people a detached and mature feeling, naturally leading one to assume he's a bit older.