A Mandarin Airlines Embraer ERJ-190, registration B-16825, sustained substantial damage in a runway excursion accident at Magong (also known as Makung), Taiwan. Flight 369 departed Taipei-Sung Shan on a domestic service to Magong. The flight was cleared to land on runway 20. Runway length available on that runway was 6890 feet and the surface was wet. The airplane crossed the runway threshold at an altitude of about 22 feet. It descended slowly, touching down on the main wheels at 2830 feet past the runway threshold. The flight crew felt that the deceleration was not what they expected and intentionally steered the plane to the left side of the runway. Just prior to reaching the runway end, they steered the plane onto the grass. The nose landing gear was ruptured and fuselage skin was damaged due to colliding with the concrete base of four taxiway lights. Findings related to probable causes: During landing phase, the flight crew early flare the aircraft, did not timely retract the thrust lever to idle position. The flight crew continued holding to the control column and did not initiate a go around or reject landing after the aircraft landed beyond the touchdown zone. After landing, the flight crew did not apply the best deceleration procedures, incorrectly considered the aircraft encountered hydroplaning and intentionally controlled the aircraft out of the runway to the grass field when approaching the end of runway. The aircraft hit the handholds of the taxiway edge lights during landing roll and damaged the nose landing gear.