[Not saintly] [No harem] [Not brainless] [Scheming] [Has a golden finger] [Decisive and ruthless] [Good at exploiting loopholes] [Skilled at underhanded schemes] (The protagonist isn't really a good person.)
He transmigrates to Douluo and becomes the seventh prince of the Great Xia Kingdom. He obtains a summoning System that lets him summon fierce generals and legions by completing missions, as well as increase his strength.
He establishes his own faction, the Brocade Smoke Pavilion, selling rare goods such as Soul Tools, pills, and Soul Bones. Soon, the whole continent looks up to him, while the Spirit Hall fears him.
He works for the good of the country and its people, helping ordinary folk improve their social standing so they no longer suffer under the nobles' oppression. He establishes an academy dedicated to serving the common people, giving them a path into government as well.
His schemes make the Spirit Hall grind its teeth in frustration:
Bibi Dong: “That Fang Jingyuan again! He's cost me dearly this time and wrecked my plans to unify the continent.”
Qian Daoliu: “Fang Jingyuan, you scoundrel! You've ruined the reputation the Spirit Hall spent years carefully building. Infuriating!”
(The protagonist is a bit overpowered early on, but his golden finger barely appears in the middle and later arcs. The blurb doesn't do it justice, so read the story.)
The plot is quite novel, differing somewhat from typical Douluo Continent fanfiction. The protagonist places great importance on the people's livelihood, working for the country and its people; the later plot likely revolves around helping the common people escape oppression from the nobility. The protagonist isn't an absolutely righteous good guy. He's somewhat ruthless.