Treatment Effect According to Timing of Administration of DWP14012 40 mg

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. Subjects will visit the site at Week 2 for endoscopic assessment. Subjects whose mucosal breaks have completely healed will be prematurely withdrawn and considered to have reached end of treatment. Subjects whose mucosal breaks have not healed will continue to receive IPs for an additional 2 weeks and will visit the site for endoscopic assessment at Week 4.