People in the Alliance, Time Management Master

Time travel? Great!
Runeterra? Not bad!
A time management coach? I guess that'll do!
A sign of impending theft? A good job deserves a reward!
From Aatrox the Great Destroyer to Swift Scout Mushrooms, you can steal them all!
What are Fryegor and Silas? Do you think they can beat me, the permanent Frankenstein's monster?
…………
Mu Bai, the cheerful Sai Feng Nan, possessed an omen of theft, until his omen transformed into a jade shield of theft...
Caitlin: "Give me back my hat right now, or tonight... hehe, it'll be a cops and robbers game."
Syndra: "I clearly remember wearing them today... Mu Bai, did you take my black stockings?"
Ahri: "Hmm~ Darling's been up to no good again~"
Salafine: "Um... Mr. Mu Bai, could you please give me back my panties... Liang..."
……
Looking at the group of girls, some angry and some shy, Mu Bai felt that things were getting complicated.
[PS: This book is also known as "Omen of Theft? The Jade Shield of Theft!", "In the League, a Time Management Master", and "I Just Wanted to Steal a Skill, Why Do You All Say I Stole Your Hearts?"]