Because his father refused to clearly name any of his sons as his heir, all of his sons--except Li--were vying for their father's attention. Li however was trying not to draw any attention because--by the time he was 12--he already knew he was just not cut out for life with his 'family'. Then, late one night shortly after his 19th birthday, he noticed a strange glowing mark on his thigh. Puzzled, he stared at it wondering what it was. And then realization dawned on him! It was the legends come to life once more, and he was one of the Byakko shichi seishi! A Byakko seishi born in Kutou to a man who wouldn't understand having a non-Seiryuu son!
He was able to hide the truth from everyone in the household for several days, mostly because few people paid him much attention since his mother was dead. And then, a few days later one of his brothers saw mark and ran to tell their father. Li, knowing what would happen when his father discovered the truth--after all the old man was still muttering about the family's losses during the War--Li saddled a horse and fled into the night, taking what valuables he had and the little bit of money he had saved. He'd always known that some day he'd be on his own, it had just come much sooner than he'd anticipated and under far stranger circumstances!