Jiang Yang, second on the hitman's rankings, codename "Source Code," and a part-time hacker.
Because he was cold and heartless, he was thrown into mission worlds to learn how to be human. But every identity he got was that of an annoying pest who did nothing good. So he let loose, infuriating the Mr. Xu he ran into in every world until the man was so furious he nearly ascended to Buddhahood, then kicking the bucket and making a lightning-fast escape.
An excellent hitman always puts efficiency first and never dawdles.
(May be revised. Screenshot saved on 2022.4.27.)
Premise: Love is not something outside oneself