After quickly wearing the second male lead who was rejected

"Double male protagonists + quick travel + strong alliance + system + love at first sight" Gu Chang was drinking water - cold water stuck in his teeth, his brain twitched, and his eyes went dark. Suddenly, he became the affectionate male second in a world that was not normal for Mary Sue, and was rejected by the female protagonist on the spot. Gu Chang was confused: "Ding Dong! Welcome to unlock the system. This system will bring you a brand new world! As long as the host completes the task, changes the deviated plot ending, and accumulates a certain number of points, you can exchange for a gift package to take home!" Gu Chang: Interesting. System (flattering face): Please complete more tasks, host~ But Gu Chang didn't expect that he could also be in various Mary Sue worlds...