Yin Li, supposedly the "wife" of Zhang Wuji, fell in love with him when they were young. But, it's not the adult ZWJ that she likes (though there are 3 other pretty babes interested in the adult form), instead she likes the younger form of ZWJ (in his childhood years).
Which do you prefer? Bearing in mind that ZWJ became a wishy-washy, somewhat irritating guy who doesn't know how to enjoy life, his younger days seems to be more appealing.