Trying to figure out what the original brand of frame this is. The original owner said it was repainted and it doesnt seem to be an s-works frame
With a lot of patience (i.e., if your time has no value to you) you can try to match partial parts of the serial code (you probably find it under the bottom bracket) with serial codes on the site bike-index.org. This way you may (I stress, you may) have a clue about the original manufacture/assembler of the bicycle you are interested in.
My suggestion is to let it go, it may look like a S-Works, it may have parts that looks like a S-Works, but there is no guarantee that it is even properly assembled. In my opinion, it is likely to be a zombie-bicycle that will let you stranded in the middle of an intersection and consequently being maimed by a truck.
I'd bet that this is not an s-works frame.
- Seat stays terminate at the top tube. Most of the s-works bikes have dropped seat stays, so they meet the seat tube well-below the point where the top tube and seat tube intersect.
- The welds are visible. On a bike that sells for 5-digit price tags, the welds are blended and invisible
- The welds are there. Any recent expensive road bike will be carbon fibre, which does not take to being welded. So this frame is probably aluminium. I am discounting steel because the downtube and top tube have gentle curves which looks like hydroformed aluminium.
- Groupset is 105. A top-flight bike would have had Dura Ace in the day.
- Pedals - they're flats. I cannot imagine anyone riding a $10k bike with flat pedals.
Certainly some of these differences can be explained away, but not all of them.
Photos to show the differences:
On the positive side
What you do have is a nice-enough aluminium road bike frame, with some kind of tapered head tube. The fork may be carbon fibre, or it might be aluminium too.
It has mounts on the fork for a front fender/mudguard, which is nice. The rear dropouts don't have any eyelets visible.
Shimano 105 is a great workman groupset, and is fully functional. Due to trickle-down, your 105 gear is probably equal or better to dura ace of last decade.
The frame's paint looks excellent - a nice depth of colour that really has dimensionality to it. Decent-looking Mavic branded wheels too and a fisik saddle are all well-known brands.
I suspect someone has purchased decals or water transfers from an online seller, like https://www.etsy.com/nz/listing/464033041/specialized-s-works-frame-decals-x-12 or any number of ebay listings. These cost under $20 and will let anyone label a bike as something it is not to claim it is fancy.