Some afternoons in the spring our backyard is a highway for small birds traveling along the edge of the woods. They generally don’t stop long, but this bird was probably a juvenile and appeared to be waiting on some parental guidance.
The Merlin Bird ID app identified this as either an Ash-throated Flycatcher or Great Crested Flycatcher from the two photos below. The Great Crested is most likely to be found in South Carolina.
Also, the “lemon-yellow belly” description of the Great Crested was what first made me notice him as it flashed in the sun.