There was a lot of metal shavings coming off the rear wheel,
so I watched YouTube and tried to replace the disc pads myself, but brake oil started leaking,
so following advice from folks on the forum, I also tried bleeding the brakes after watching YouTube,
and now the lever oil cap screw is stripped and the brake rubber cap is torn,
so now I have more stuff to replace lol
Luckily, after searching around, everything was available on AliExpress or Naver so I placed an order lol
I got into DIY maintenance at first thinking I'd save on shop labor costs and go for cost efficiency,
but I think I need to accept it as a hobby now lol — it seems like it costs slightly less than a shop when you factor in time + money