I Just Turned 18 and Transmigrated into a Martial Arts MMO as the Big Boss

Game + martial arts MMO + slight ensemble cast + a little angst + nontraditional wuxia, with a touch of xianxia. Also known as I Turned 18 and Transmigrated Into a Nontraditional Martial Arts MMO, Where Players Made Me Swear Brotherhood With Them

I, Dan Chen, had just celebrated my eighteenth birthday when I died saving someone, then transmigrated into a nontraditional martial arts MMO that hadn't even been released on Blue Star. With no other choice, I took the System's advice, became one of the game's creators, and named it Dream of Mountains and Rivers. After three years, the game finally launched, but six people surrounded me and insisted I become their big brother.

Later, when the game world faced total destruction, I finally realized why those six seemed so familiar. It turned out to be a reunion with old friends.