Soul Arts: Mystic Eyes

Eyes type martial soul? I do not think so. Tian Xie grew up with his dad and no mom. No matter what how many times he asked about his mom to his father, he did noy receive any concrete answer. Not until he awakens an eye type martial soul, his father gave him a strange book and let him, a 6 year old boy go to a journey without a second thought. What are the secrets behind his martial soul, that even his father let him go on his own despite being a 6 year old kid?