Ugh, parts of this was confusing.. Who was he in his previous life and why did he die.. So he conqured his school, but died to a mafia gang is the only way I can interpret it.
@kilisloe My guess is cause he was an alcoholic . Then hit rock bottom. Thus became a scum of a person no giving a shit about anything. From what I made of it, even the childhood friend told him to fuck off... so no childhood friend in this manwha :s