The paper discusses the mechanism of dark matter freeze-in at stronger coupling, where the Standard Model (SM) bath temperature never exceeds the dark matter mass. This scenario is attractive because it can be probed by direct detection experiments and the LHC. The authors explore a simple UV complete framework where the maximal temperature of the SM thermal bath coincides with or is close to the reheating temperature, ensuring that dark matter production is always Boltzmann-suppressed. They demonstrate that this can occur if the inflaton decays primarily into feebly interacting right-handed neutrinos, which subsequently generate the SM thermal bath. In such models, the SM sector temperature remains constant over cosmological times before reheating, allowing for a reliable calculation of dark matter abundance. The paper also examines the impact of different decay widths of the inflaton and right-handed neutrinos on the temperature evolution and the resulting dark matter abundance. The authors find that the parameter space for this scenario is consistent with direct detection constraints and that the LHC can provide complementary constraints through precise measurements of the Higgs invisible decay. Overall, the dark matter freeze-in at stronger coupling offers an interesting alternative to traditional freeze-in or freeze-out models.The paper discusses the mechanism of dark matter freeze-in at stronger coupling, where the Standard Model (SM) bath temperature never exceeds the dark matter mass. This scenario is attractive because it can be probed by direct detection experiments and the LHC. The authors explore a simple UV complete framework where the maximal temperature of the SM thermal bath coincides with or is close to the reheating temperature, ensuring that dark matter production is always Boltzmann-suppressed. They demonstrate that this can occur if the inflaton decays primarily into feebly interacting right-handed neutrinos, which subsequently generate the SM thermal bath. In such models, the SM sector temperature remains constant over cosmological times before reheating, allowing for a reliable calculation of dark matter abundance. The paper also examines the impact of different decay widths of the inflaton and right-handed neutrinos on the temperature evolution and the resulting dark matter abundance. The authors find that the parameter space for this scenario is consistent with direct detection constraints and that the LHC can provide complementary constraints through precise measurements of the Higgs invisible decay. Overall, the dark matter freeze-in at stronger coupling offers an interesting alternative to traditional freeze-in or freeze-out models.