Air taxi First Officer reported on touchdown noticing another aircraft on the opposite direction runway. Flight crew executed a go around.

Narrative

While flying a scheduled (but delayed) route from ZZZ1 to ZZZ on the afternoon of Day 0; the SIC was the pilot flying and the PIC was the pilot monitoring. The ZZZ AWOS reported broken ceilings at 6;000 feet and winds from the Northeast at 8 knots. The PIC and SIC agreed to fly a straight in; visual approach for runway XX. The SIC programmed the RNAV XX approach in the FMS. On descent; the crew obtained visual contact with the runway when they were approximately 25 miles to the West; at which point they cancelled their IFR clearance and switched to the ZZZ advisory frequency. The SIC asked the PIC to program the FMS so that the aircraft would navigate to ZZZZZ and also asked for an altitude of 8500 feet in order to establish a stable approach and glide path for runway XX. The PIC made standard radio calls at 20 miles; 10 miles; and 5 miles. A sterile cockpit was also maintained during the entirety of the approach and landing sequence. No other aircraft transmitted on the ZZZ CTAF during the flight's approach; landing; or go around. The SIC followed a standard configuration schedule and the before landing checklist was complete by 1;000 AGL. The thick; broken layer of clouds cloaked the airport environment in an unnatural darkness for the late afternoon. Both pilots continuously scanned the runway for hazards since ZZZ is notorious for having coyotes on the runway and this was briefed as a potential threat in the SICs approach briefing. The approach was stable at 500 feet and the runway perceived to be clear by both pilots. Upon touchdown on the 1;000 foot markers of runway XX the PIC noticed another aircraft pointed at then on the runway. The PIC immediately called 'go around.'The SIC hesitated; but then noticed the aircraft and applied takeoff power. The PIC called 'rotate' at an estimated Vr of 103 knots. The SIC pitched the plane into a takeoff power and then the PIC took control of the power to prevent over torquing the engine. Standard go around procedures were followed. The SIC continued to hand fly the aircraft as the PIC bugged the traffic pattern altitude of 8;000. The PIC asked on the advisory frequency it any other. aircraft were on the runway in ZZZ or if any other aircraft were in the area. No reply was received. The PIC verified the crew was listening to the correct frequency. In the downwind; the runway was perceived to be clear. The SIC flew a standard visual traffic pattern and landed uneventfully. The aircraft that caused the go around was parked on the ramp in ZZZ when the crew taxied in. After conducting post flight procedures and deboarding passengers; the PIC approached the pilot who said he was ferrying the aircraft and did not have working lights or radios on the aircraft.