Comment by Mllia on Kurou

@Kurou to explain it, they cut out a lot of information from the novel, but if you remember, there was a crow mask from one of the chapters previously that worked in the lab with his parents basically his current self the grown-up one, took the name of that person and is using that As an identity instead of his actual name that the crow mask gave him The grown-up version of him is using his memories from his previous life with the crow mask t gain the trust of his younger self and claiming him as his younger brother they might explain it a little bit more in the next chapters. If you have any questions you can ask.