Peerless Medicine God - Chapter 17 - : Trust and Choice

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

The reborn Xu Renshan originally bought 50 times the lottery ticket with his memory, but he passed away with a huge sum of 200 million yuan.

Originally, he could successfully interview with the advantage of rebirth and become a civil servant, but he changed his mind when he met a rich woman on a blind date.

The civil servants who work from nine to five can’t compare to soft rice.

…

Many years later, the tens of billions of rich women, heh, his assets are increasing by tens of billions of income every year, and the unit is US dollars.

- Description from novelbuddy

Ajax was an orphan who survives a massacre along with his friends but unfortunately gets separated from them.

Fortunately, after a turn of events, he successfully gains a system which helps him increase his cultivation, but doesn't know what it is called.

But he knows one thing for sure, this system is very powerful and helpful in taking his revenge.

“Whoever you are, I am gonna find you”, Ajax mumbled himself with a disgruntled expression.

In a world where Summoning of an elemental spirit is done through a dream when they are 15 years old, Ajax with the help of a system and his summoned spirits sets out on a journey to seek revenge against the mastermind behind the massacre.