Subjects will provide written informed consent for study participation and then undergo appropriate screening. Subjects who meet the inclusion criteria and none of the exclusion criteria will be randomized in a 1:1 ratio to either before meal group or after meal group. Subjects will be stratified into two groups according to Los Angeles classification grades (LA grades) A/B or C/D, as determined by upper gastrointestinal (GI) endoscopy.
The primary objective of this study is to establish noninferiority of efficacy of DWP14012 (40 mg once daily) based on Timing of Administration.