Wu Long did not release all of the memories at once, carefully sifting through them as it was a delicate process, even insignificant in his eyes time of 16 years had to be approached with caution since they were initial memories and not intermittent ones of that personality. To not be influenced by the possible naivety or any other deviation of the character of Wu Long before awakening which was more than possible since such early memories had a big impact on one's personality and worldview, he had to carefully examine the memories from the viewpoint of his current self, more like watching scenes and visions than experiencing them. Thus, once he made Ye Ling overjoyed with the news, he continued to explore the memories he just unsealed, which at some point brought a frown to his face.
The story of the younger years of his new self was fairly simple.