The Author Can't Let the Side Characters Break Up!

-Congratulations, User! You have been bound to True Love System!-So, who is it? Luo Binghe and Liu Mingyan? Sha Hualing? But from the timeline - oh, no, tell me it's not Su Xiyan and Tianlang-jun. System-bro, how could you do this to me - -Mission: Seven Plus Nine Equals Love!-...So, how about that Su Xiyan and Tianlang-jun?-Shang Qinghua finds himself in the body of a doomed side character with an even more doomed mission. It's time to untangle the knots of his own tragic backstory, with only the aid of his own cunning brain, the world's least helpful system... and a suspiciously helpful ice demon?-The Villainess Won't Let the Main Leads Break Up! Fusion.