How I Became an SSS Rank Delivery Hunter

This one is strange.
Mc gets job as interdimensional courier, people from other worlds know about people like that, so on his first delivery they (some important aristocrats of this world) stage some bullshit play, which gets explained in chapter 12, but all that happened… Ok, Count wanted some guy who is romantically involved with his daughter Celene to die, he arrested him, then he manipulated Celene to call Mc for delivery, then instructed her to give mc some ring as gift, which would mark him as assassin then he should have been captured and his other daughter would help clean his name and Count would say that Celene and her lover planned to blame the guy and would execute them, but Mc run away with other daughter instead of getting captured and Count had to do things differently, blaming his loyal knight and killing him…
And from one side it’s kinda interesting, from the other… it’s seems like some bullshit, and the one who gave mc job was involved in that… and brother of MC makes contract with someone and doesn’t tell his brother… it all feels off.
Ok, so from description:
“finds himself transported to another world—where he becomes the first-ever deliveryman in a land of magic and chaos”
He isn’t first, there seems to be others.
Like everyone know what kind of job he has and what kind of items he has, everyone wants something from him…
Wait, mc ruined Count plans not because hes good in something or because he’s smart, at least story doesn’t makes accent on him, it makes accent on him being pretty good delivery guy, but he escaped just because, it just happened, characters seem strange, drama is boring, MC brother seem to be suffering from illness, but they dont show it properly, don’t make us feel it, and we not exactly sure why count need him, why does alchemist from chapter 13 attack mc, if he supposedly knows that deliverers like him deliver sinners to demons, it’s all weird.