He's in the Marvel universe, and his first step is marrying Scarlet Witch.

There's a saying: "Settle down first, then build a career."
Having transmigrated to the dangerous Marvel universe and become the wealthy heir of Sokovia, Li Chuan revitalizes his family, marries Wanda before she joins the Hydra experiments, and embarks on his journey to become stronger across the universe.
The main universe is Marvel, with countless smaller universes. Currently accessible is the Naruto universe. The next universe is Fantastic Beasts and Where to Find Them.
(There's already a high-quality book with 16,000 copies available: Marvel's Hogwarts Wizarding Guide. Feel free to read it.)