Not quite sure since it is relatively early in the story. I don't remember in full detail.
¤How did the world reacted when luo feng came back?
click to show/hide spoilersShock of course. I think at this stage Luo Feng was still a member of Hong's Unlimited Dojo, albeit quite high ranking. Luo Feng has not yet reached the "spiritual"/de-facto leader of Earth.
¤What do you mean by "treasures"?
click to show/hide spoilersI think Luo feng had some automatons from an ancient wrecked starship and loads of energy crystals that can be used to boost people (and other organisms).
¤What happened to the despicable/evil organisation and individuals? How did Luo Feng payed them back, and did someone help their families?
click to show/hide spoilersHe definiitely killed some, can't remember if he dismantled any organisations. I think that Luo Hua had to sell part of his company - can't remember to whom in order to get some protection from the government I think. You can buy "citizenship" levels which have different levels of benefits.