Phase III Study to Evaluate the Efficacy and Safety of AGSAVI in Patients With Essential Hypertension Inadequately Controlled With AGLS

Inclusion Criteria: * Hypertension patient who satisfied below condition at Visit 1. * patient who takes antihypertensive drug * 140mmHg \<= MSSBP \< 200mmHg * 130mmHg \<= MSSBP \< 200mmHg at or before visit 1(In high-risk patients) * patient who doesn't take antihypertensive drug * 160mmHg \<= MSSBP \< 200mmHg * Hypertension patient who satisfied below condition at Visit 2. * 140mmHg \<= MSSBP \< 200mmHg at Visit 2 * 130mmHg \<= MSSBP \< 200mmHg at or before Visit 1(In high-risk patients) Exclusion Criteria: * Patient who have received 4 or more antihypertensive drug * Patient with 20mmHg\>= of difference in MSSBP or 10mmHg\>= of difference in MSDBP between 2 times of BP measuring at Visit 1 * Patient with MSDBP \>= 120mmHg at Visit 1 or 2 * Patient with secondary hypertension(including past medical history)