The car in question is a 2018 Kia K3 Turbocharged I4 1.6L Diesel Signature (Top) with 121,500 km mileage, in good condition, and non-GCC specs. We have two listed prices for similar cars: a 2017 Kia K3 I4 1.6L Diesel Prestige (Mid) with 123,990 km listed at SAR 47,000, and a 2020 Kia K3 I4 1.6L Diesel Prestige (Mid) with 152,500 km listed at SAR 49,500. The 2018 model is newer than the 2017 model and has a higher trim level (Signature vs. Prestige), which typically commands a higher price. However, it is older than the 2020 model. Considering the 2017 model's price and adjusting for the higher trim and newer year, the estimated price should be higher than SAR 47,000. The 2020 model's price provides an upper boundary. Given these factors, the estimated market price for the 2018 model is calculated to be between these two values, taking into account the higher trim level and similar mileage.