They met because of e-sports.
"Tiandao" is a new game with different professions to choose from. The most popular ones are: guns, cannons, swords, auxiliary, and boxing. The less popular ones are: piano, ghost, magic, and hammer. Han Yize's profession is a gun, while Su Che's profession is a piano.
They met because of e-sports, and they had an agreement that only they knew: to chase their dreams together and succeed together.
Intention: They met because of e-sports and got to know each other because of the same goal.