The Little Matter of Me Being a Space-Time Observer

Time is a vast loop. Every cause has an effect. As a gentle and kind (?) and diligent and hardworking (?) six-star space-time observer, Xia Nuan finally got a vacation opportunity from the Space-Time Administration: a lowest-rank, R-level mission. So she cheerfully took along the rookie assistant assigned to her by the Administration and went off on vacation. However... “Ding!” [Congratulations on achieving: “I Saved Myself.”] “...” Weren’t we told not to interfere with space-time events so casually?! Looking at the person in front of her who looked remarkably like her, the rookie assistant decided that the Space-Time Administration Employee Handbook was complete bullshit. “Ding!” [Congratulations on achieving: “I Screwed Myself Over.”] After a series of investigations, Xia Nuan discovered that the person responsible for this time-space disruption looked exceptionally familiar. “...” What a mess! “This has to be a fake R-level mission.” Xia Nuan glanced at the bandaged boy quietly reading beside her, then at the two rookie assistants across from her, who might have been chatting with their cowlicks. She couldn't help sighing dejectedly. Core theme: A goofy practice run full of mischief, lol.