The breaker that's supposed to be dedicated to your living room only turns on power to your living room? Does the other breaker turn on anything outside of your living room? For example, outside light or receptacles? Are any of the receptacles in your living room GFCI?
No gfi, they both seem to power just the living room. I left one off and can't find anything not working.
This honestly sounds like a staple went through two hots somewhere in the wall. Or someone installed a Y at the breaker panel to split the load. This is a fire hazard and you need to call an electrician.
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