I've Time-Traveled Back Again

Also known as The CEO's High School Years and What Do You Do When You Become Your Own Replacement? Yu Xing accidentally transmigrates into a CEO-and-replacement novel, becoming a senior one year ahead of the male lead. His mission is to turn the high school version of the male lead into a scumbag. System: The task of turning him bad is yours. Yu Xing: No way! The young sapling is right in the middle of puberty. Aside from being rebellious, there's nothing wrong with him. The right thing to do is nurture and care for him! So Yu Xing becomes a fine example of a senior and a good friend to Gao Shuliang, encouraging his dear aspiring CEO of a junior to grow up strong and healthy. But before he knows it, he has become the dazzling moonlight in the boy's heart. One careless step leads to a lifetime of regret. After failing his mission, he "dies" and returns home, never realizing that his "death" becomes the cause of his junior's twisted heart. What's worse, one day he finds himself back in that world. Yu Xing: Surprised? Didn't see that coming? I'm back! Gong Ran: You look awfully familiar, dear. :) Yu Xing: Fate sure has a sense of humor, dear. :3 Gong Ran: Oh? (glances at the "portrait" of his senior) Yu Xing: ??? This is so thrilling. I've become my own replacement. :) The CEO junior I once led astray: even if I have to get on my knees, I'll make him fall for me all over again. [Important Notes and Content Warnings] 1. Junior first, CEO later: Gong Ran; senior first, secretary later: Yu Xing. 2. A sweet, angst-free high school romance in the beginning. Things get serious later, when the junior grows up and the senior returns! Theme: Dare to defy fate and treat others with kindness