PAL-XFEL project is aiming to produce 0.1 nm coherent X-ray laser to photon beam users. In order to produce such photons, there are 10-GeV electron linac based on S-band normal conducting accelerating structures and a 150-m long out-vacuum undulator system. The project was started in April 2011, and the 1.11 km-long building was completed in February 2015. The installations of 10 GeV linac, undulator systems, and beamlines have been completed by the end of 2015. The operation permit was issued on April 12, 2016, and the beam commissioning was started immediately. On April 25, the linac was able to accelerate electron beams from RF photocathode electron gun to 10 GeV, which is the design value. By the end of June 2016, the commissioning has achieved its first goal by lasing 0.5 nm coherent X-ray photons. Now, PAL-XFEL has started user services from June 2017. Korean scientists as well as international ones have new research opportunities with PAL-XFEL, especially in the fields of ultra-fast chemical studies and structural molecular imaging.