Love Begins by Reversing the Timeline

Inside the world's strongest tower. Guard Chief: "In other words, you can travel to any parallel universe?" Xu Wei: "Yes, to be precise, my ability is a 'simulator'. Of course, it also has an unorthodox name - the love simulator of the original cause and effect collection container of the all-parallel universe..." Chief of Guard: "Wait a minute... You mean, those heroes from the parallel universe outside: the Scarlet Queen who unlocked all genetic locks, the immortal Winter Witch, the ace pilot of the ultimate mecha, the demon hunter who walks on the moon, these people are all..." Xu Wei: "Ahem, yes, I saved their universe." Chief of Guard: "Then why are you hiding in the tower? In a sense, you are the safest human being in the world, right?" Xu Wei: "... Well, it's a long story..." ... ... The introduction is weak, please read the main text. In short, this is the protagonist's "warm and peaceful" love life in different worlds where he goes crazy and does things.