Longevity: I Have a Coupon for Discounts on Everything

Chen Lang transmigrates to the cultivation world and obtains a proficiency panel, along with a discount coupon that takes ten off every thirty. Every time his proficiency reaches 30 points, the cap automatically drops by 10. Wind Bullet Technique (Beginner 0/200). At 30 proficiency: Wind Bullet Technique (Beginner 30/190). Relying on his discount coupon, he avoids conflict and competition, quietly builds his strength, and climbs higher step by step. When he turns thirty... “Wait, why did my age get reduced to twenty too?”