Immortal Cultivating Sect in the Underworld

[Mixing the gang + cultivating a younger brother + system + cultivating immortals + realistic gamification] PS: The protagonist trains his younger brother to cultivate immortality, equips him with countless skills, unifies the underworld, challenges the ancient martial arts family, and builds the Immortal Mountain. In that world of intrigue and cruel reality, it is not easy to survive. There is no such thing as quiet time, it's just that someone is carrying the burden for you. The bosses overcame obstacles, led their brothers to overcome countless difficulties, and still moved forward bravely in the melee. In this world, some people work hard for their dreams, some do not hesitate for the sake of family ties, and some are almost crazy for revenge. However, no matter where you go, competition remains fierce and pressure is always present. The bosses have to face unexpected events from all sides and deal with various potential crises. On this road to the underworld, every step is a struggle, and every step is full of hardships, blood and tears. But as long as you grit your teeth and move forward, one day you will see the light of hope.